Kosmochlor
A valid IMA mineral species - grandfathered
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About Kosmochlor
Formula:
NaCrSi2O6
Colour:
Emerald-green, dark green
Hardness:
6
Specific Gravity:
3.51 - 3.60
Crystal System:
Monoclinic
Member of:
Name:
Named for the Greek words for space and the color green. Found as a residue after dissolution of the Toluca iron meterorite.
Type Locality:
Pyroxene Group - Clinopyroxene Subgroup.
Jadeite-Kosmochlor Series.
A rare, bright green pyroxene, found in some jade deposits and meteorites.
Also a colouring component of the decorative rock Maw Sit Sit.
Compare UM2003-36-SiO:CaNa.
Jadeite-Kosmochlor Series.
A rare, bright green pyroxene, found in some jade deposits and meteorites.
Also a colouring component of the decorative rock Maw Sit Sit.
Compare UM2003-36-SiO:CaNa.
Unique Identifiers
Mindat ID:
2258
Long-form identifier:
mindat:1:1:2258:9
IMA Classification of Kosmochlor
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
NaCr3+Si2O6
Classification of Kosmochlor
9.DA.25
9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
65.1.3c.4
65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
14.15.1
14 : Silicates not Containing Aluminum
15 : Silicates of Cr
14 : Silicates not Containing Aluminum
15 : Silicates of Cr
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Kos | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Kos | Whitney & Evans (2010) | Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371 |
Physical Properties of Kosmochlor
Transparency:
Translucent
Colour:
Emerald-green, dark green
Streak:
Pale green
Hardness:
6 on Mohs scale
Cleavage:
Distinct/Good
Good on {110}
Good on {110}
Parting:
parting on {001}
Density:
3.51 - 3.60 g/cm3 (Measured) 3.60 g/cm3 (Calculated)
Optical Data of Kosmochlor
Type:
Biaxial (-)
RI values:
nα = 1.740 - 1.766 nβ = 1.756 - 1.778 nγ = 1.745 - 1.781
2V:
Measured: 6° to 70°
Max. Birefringence:
δ = 0.005 - 0.015
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
strong
Pleochroism:
Strong
Comments:
X = yellowish green; Y = blue-green, grass-green; Z = emerald-green.
Chemistry of Kosmochlor
Mindat Formula:
NaCrSi2O6
Element Weights:
Elements listed:
Common Impurities:
Ti,Al,Fe,Mn,Mg,Ca,K,P
Crystallography of Kosmochlor
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 9.550 Å, b = 8.712 Å, c = 5.273 Å
β = 107.44°
β = 107.44°
Ratio:
a:b:c = 1.096 : 1 : 0.605
Unit Cell V:
418.54 ų (Calculated from Unit Cell)
Z:
4
Twinning:
Simple, lamellar on {100}, {001}.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000359 | Kosmochlor | Cameron M, Sueno S, Prewitt C T, Papike J J (1973) High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene, and ureyite pyroxene American Mineralogist 58 594-618 |  | 1973 | 0 | 297 | |
| 0000360 | Kosmochlor | Cameron M, Sueno S, Prewitt C T, Papike J J (1973) High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene, and ureyite pyroxene American Mineralogist 58 594-618 | | 1973 | 0 | 673 | |
| 0000361 | Kosmochlor | Cameron M, Sueno S, Prewitt C T, Papike J J (1973) High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene, and ureyite pyroxene American Mineralogist 58 594-618 | | 1973 | 0 | 873 | |
| 0002806 | Kosmochlor | Secco L, Martignago F, Dal Negro A, Reznitskii L Z, Sklyarov E V (2002) Crystal chemistry of Cr-V-rich clinopyroxenes Sample 1 American Mineralogist 87 709-714 | | 2002 | 0 | 293 | |
| 0003133 | Kosmochlor | Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-1032 | | 2003 | 0.0001 | 293 | |
| 0003134 | Kosmochlor | Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-1032 | | 2003 | 1.14 | 293 | |
| 0003135 | Kosmochlor | Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-1032 | | 2003 | 2.22 | 293 | |
| 0003136 | Kosmochlor | Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-1032 | | 2003 | 3.53 | 293 | |
| 0003137 | Kosmochlor | Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-1032 | | 2003 | 5.05 | 293 | |
| 0003138 | Kosmochlor | Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-1032 | | 2003 | 5.78 | 293 | |
| 0003139 | Kosmochlor | Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-1032 | | 2003 | 6.25 | 293 | |
| 0003140 | Kosmochlor | Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-1032 | | 2003 | 7.08 | 293 | |
| 0003141 | Kosmochlor | Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-1032 | | 2003 | 7.23 | 293 | |
| 0003142 | Kosmochlor | Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-1032 | | 2003 | 7.39 | 293 | |
| 0003143 | Kosmochlor | Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-1032 | | 2003 | 8.5 | 293 | |
| 0003144 | Kosmochlor | Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-1032 | | 2003 | 8.97 | 293 | |
| 0003145 | Kosmochlor | Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-1032 | | 2003 | 9.28 | 293 | |
| 0020188 | Kosmochlor | Posner E S, Dera P, Downs R T, Lazarz J D, Irmen P (2014) High-pressure single-crystal X-ray diffraction study of jadeite and kosmochlor Physics and Chemistry of Minerals 41 695-707 | 2014 | synthetic | 2.1 | 293 | |
| 0020189 | Kosmochlor | Posner E S, Dera P, Downs R T, Lazarz J D, Irmen P (2014) High-pressure single-crystal X-ray diffraction study of jadeite and kosmochlor Physics and Chemistry of Minerals 41 695-707 | 2014 | synthetic | 18.5 | 293 | |
| 0020190 | Kosmochlor | Posner E S, Dera P, Downs R T, Lazarz J D, Irmen P (2014) High-pressure single-crystal X-ray diffraction study of jadeite and kosmochlor Physics and Chemistry of Minerals 41 695-707 | 2014 | synthetic | 31.3 | 293 | |
| 0020191 | Kosmochlor | Posner E S, Dera P, Downs R T, Lazarz J D, Irmen P (2014) High-pressure single-crystal X-ray diffraction study of jadeite and kosmochlor Physics and Chemistry of Minerals 41 695-707 | 2014 | synthetic | 35.3 | 293 | |
| 0020192 | Kosmochlor | Posner E S, Dera P, Downs R T, Lazarz J D, Irmen P (2014) High-pressure single-crystal X-ray diffraction study of jadeite and kosmochlor Physics and Chemistry of Minerals 41 695-707 | 2014 | synthetic | 40.2 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.956 Å | (100) |
| 2.867 Å | (100) |
| 2.5166 Å | (90) |
| 2.4476 Å | (70) |
| 2.0985 Å | (70) |
| 1.5957 Å | (70) |
| 1.3802 Å | (60) |
Comments:
Synthetic
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 2: Planetesimal differentiation and alteration | 4.566-4.550 |
| 5 : Primary asteroid phases | 4.566–4.560 |
Type Occurrence of Kosmochlor
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 81869, 81870; The Natural History Museum, London, England, 81869{81870.
Geological Setting of Type Material:
e jadeitites
Associated Minerals at Type Locality:
Synonyms of Kosmochlor
Other Language Names for Kosmochlor
Relationship of Kosmochlor to other Species
Member of:
Other Members of Clinopyroxene Subgroup:
| Aegirine | NaFe3+Si2O6 | Mon. 2/m : B2/b |
| Aegirine-augite | (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 | Mon. 2/m : B2/b |
| Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 | Mon. 2/m : B2/b |
| Burnettite | CaVAlSiO6 | Mon. 2/m : B2/b |
| Clinoenstatite | MgSiO3 | Mon. 2/m : P21/b |
| Clinoferrosilite | Fe2+2Si2O6 | Mon. 2/m : P21/b |
| Colomeraite | NaTi3+Si2O6 | Mon. 2/m : B2/b |
| Davisite | CaScAlSiO6 | Mon. 2/m : B2/b |
| Diopside | CaMgSi2O6 | Mon. 2/m : B2/b |
| Esseneite | CaFe3+[AlSiO6] | Mon. 2/m : B2/b |
| Grossmanite | CaTi3+ AlSiO6 | Mon. 2/m : B2/b |
| Hedenbergite | CaFe2+Si2O6 | Mon. 2/m : B2/b |
| Jadeite | Na(Al,Fe3+)Si2O6 | Mon. 2/m : B2/b |
| Jervisite | NaSc3+Si2O6 | Mon. 2/m : B2/b |
| Johannsenite | CaMn2+Si2O6 | Mon. 2/m : B2/b |
| Kanoite | Mn2+(Mg,Mn2+)Si2O6 | Mon. 2/m : P21/b |
| Kushiroite | CaAlAlSiO6 | Mon. 2/m : B2/b |
| Namansilite | NaMn3+Si2O6 | Mon. 2/m : B2/b |
| Natalyite | NaV3+Si2O6 | Mon. 2/m : B2/b |
| Omphacite | (NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6 | Mon. 2/m |
| Petedunnite | CaZnSi2O6 | Mon. 2/m : B2/b |
| Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 | Mon. 2/m : P21/b |
| Ryabchikovite | CuMgSi2O6 | Mon. 2/m : P21/b |
| Spodumene | LiAlSi2O6 | Mon. 2/m : B2/b |
| Tissintite | (Ca,◻)AlSi2O6 | Mon. 2/m : B2/b |
| UM2001-19-SiO:AlCaMgNa | (Na,Mg,Ca)(Mg,Al)Si2O6 | Mon. 2/m : B2/b |
| UM2003-36-SiO:CaNa | NaCrSi2O6 - CaMgSi2O6 | Mon. 2/m : B2/b |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
| 7 photos of Kosmochlor associated with Chromojadeite | Na(Al,Cr)Si2O6 |
| 6 photos of Kosmochlor associated with Jadeite | Na(Al,Fe3+)Si2O6 |
| 4 photos of Kosmochlor associated with Albite | Na(AlSi3O8) |
| 4 photos of Kosmochlor associated with Maw Sit Sit | |
| 2 photos of Kosmochlor associated with Chromium-bearing Magnesio-arfvedsonite | [Na][Na2][Mg4(Fe3+,Cr3+)]Si8O22(OH)2 |
| 1 photo of Kosmochlor associated with Native Tin | Sn |
| 1 photo of Kosmochlor associated with Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| 1 photo of Kosmochlor associated with Eckermannite | NaNa2(Mg4Al}Si8O22(OH)2 |
Related Minerals - Strunz-mindat Grouping
| 9.DA. | Colomeraite | NaTi3+Si2O6 |
| 9.DA. | Protoenstatite | Mg2Si2O6 |
| 9.DA. | Ryabchikovite | CuMgSi2O6 |
| 9.DA.05 | Donpeacorite | (Mn,Mg)MgSi2O6 |
| 9.DA.05 | Enstatite | Mg2Si2O6 |
| 9.DA.05 | Ferrosilite | Fe2+2Si2O6 |
| 9.DA.10 | Clinoenstatite | MgSiO3 |
| 9.DA.10 | Clinoferrosilite | Fe2+2Si2O6 |
| 9.DA.10 | Kanoite | Mn2+(Mg,Mn2+)Si2O6 |
| 9.DA.10 | Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| 9.DA.15 | Grossmanite | CaTi3+ AlSiO6 |
| 9.DA.15 | Diopside | CaMgSi2O6 |
| 9.DA.15 va | Jeffersonite | Ca(Mn,Zn,Fe)Si2O6 |
| 9.DA.15 | Hedenbergite | CaFe2+Si2O6 |
| 9.DA.15 | Johannsenite | CaMn2+Si2O6 |
| 9.DA.15 | Petedunnite | CaZnSi2O6 |
| 9.DA.15 | Esseneite | CaFe3+[AlSiO6] |
| 9.DA.15 | Kushiroite | CaAlAlSiO6 |
| 9.DA.15 | Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| 9.DA.15 | Davisite | CaScAlSiO6 |
| 9.DA.20 | Aegirine-augite | (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 |
| 9.DA.20 | Omphacite | (NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6 |
| 9.DA.25 | Jadeite | Na(Al,Fe3+)Si2O6 |
| 9.DA.25 | Namansilite | NaMn3+Si2O6 |
| 9.DA.25 | Natalyite | NaV3+Si2O6 |
| 9.DA.25 | Aegirine | NaFe3+Si2O6 |
| 9.DA.25 | Jervisite | NaSc3+Si2O6 |
| 9.DA.25 | Tissintite | (Ca,◻)AlSi2O6 |
| 9.DA.30 | Spodumene | LiAlSi2O6 |
| 9.DA.35 | Hiroseite | FeSiO3 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Kosmochlor in petrology
An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.
Internet Links for Kosmochlor
mindat.org URL:
https://www.mindat.org/min-2258.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
References for Kosmochlor
Reference List:
Frondel, C., Klein, C. (1965) Ureyite, NaCrSi2O6: A New Meteoritic Pyroxene. Science, 149 (3685). 742-744 doi:10.1126/science.149.3685.742
Neuhaus, A. (1967) Über Kosmochlor (Ureyit). Die Naturwissenschaften, 54 (15). 440-441 doi:10.1007/bf00603143
Cameron, Maryellen, Sueno, Shigeho, Prewitt, C. T., Papike, and J. J. (1973) High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene, and ureyite. American Mineralogist, 58 (7-8) 594-618
Yang, Chin Mei Ou (1984) A terrestrial source of ureyite. American Mineralogist, 69 (11-12) 1180-1183 (as ureyite)
Morimoto, N., Fabries, J., Ferguson, A. K., Ginzburg, I. V., Ross, M., Seifert, F. A., Zussman, J., Aoki, K., Gottardi, G. (1988) Nomenclature of Pyroxenes. Mineralogical Magazine, 52 (367) 535-550 doi:10.1180/minmag.1988.052.367.15
Secco, L., Martignago, F., Negro, A. Dal, Reznitskii, L.Z., Sklyarov, E.V. (2002) Crystal chemistry of Cr3+-V3+-rich clinopyroxenes. American Mineralogist, 87 (5) 709-714 doi:10.2138/am-2002-5-613
Origlieri, Marcus J., Downs, Robert T., Thompson, Richard M., Pommier, Carolyn J.S., Denton, M. Bonner, Harlow, George E. (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes. American Mineralogist, 88 (7) 1025-1032 doi:10.2138/am-2003-0711
Localities for Kosmochlor
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Azerbaijan | |
| Lee M R et al. (1995) |
France | |
| Greshake et al. (1996) |
Germany | |
| Collection of Bernd Ternes. |
India | |
| Krátký et al. (2018) |
Italy | |
| Fornaseri M. (1939) |
Japan | |
| wwwsoc.nii.ac.jp/jampeg/93-11.htm. |
| Fossa Magna Museum specimen |
| Suzuki Y and Ohki Y (2019) +2 other references | |
| Sakamoto & Takasu (1996) |
Mexico | |
| Phil. Trans. R. Soc. Lond A. 286 (1977) |
| Laspeyres +1 other reference |
| Meteoritical Bulletin: MB 107 (2018) |
Myanmar | |
| Shi et al. (2011) +1 other reference |
| Yang (1984) +2 other references | |
New Zealand | |
| Ikehata et al. (2004) |
Oman | |
| Arai +4 other references |
Poland | |
| Karwowski et al. (2008) |
Russia | |
| Bosi et al. (2014) |
| Zapiski Vserossijskogo ... |
| Sharygin (2020) |
South Africa | |
| Phil. Trans. R. Soc. Lond A. 286 (1977) |
USA | |
| Space Science Reviews +2 other references |
| Lee M R et al. (1995) |
| Schulze et al. (2014) |
Quick NavTopAbout KosmochlorUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationKosmochlor in petrologyInternet Links References Localities Locality List
Feuerberg, Hohenfels-Essingen, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany