Chestermanite
A valid IMA mineral species
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About Chestermanite
Charles W. Chesterman
Formula:
Mg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2
Colour:
greyish-green to black in coarse crystals
Lustre:
Vitreous, Silky
Hardness:
6
Specific Gravity:
3.72
Crystal System:
Orthorhombic
Member of:
Name:
Named by R.C. Erd and E.E. Foord in 1988 in honor of Charles Wesley Chesterman (2 February 1913, Larned, Kansas, USA – 25 March 1991, Napa, California, USA), geologist and mineralogist, California Division of Mines and Geology, San Francisco, USA, who discovered the first specimens.
This page provides mineralogical data about Chestermanite.
Unique Identifiers
Mindat ID:
998
Long-form identifier:
mindat:1:1:998:2
IMA Classification of Chestermanite
Classification of Chestermanite
6.AB.40
6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
24.2.1.5
24 : ANHYDROUS BORATES
2 : A2BO2[XO3]
24 : ANHYDROUS BORATES
2 : A2BO2[XO3]
9.8.4
9 : Borates
8 : Borates of Fe
9 : Borates
8 : Borates of Fe
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Csm | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Chestermanite
Vitreous, Silky
Comment:
Vitreous to silky
Colour:
Greyish-green to black in coarse crystals
Streak:
Pale grayish green
Hardness:
6 on Mohs scale
Tenacity:
Brittle
Fracture:
Irregular/Uneven, Conchoidal
Density:
3.72(2) g/cm3 (Measured) 3.650 g/cm3 (Calculated)
Optical Data of Chestermanite
Type:
Biaxial (+)
RI values:
nα = 1.753 nβ = 1.763 nγ = 1.791
2V:
Measured: 63° , Calculated: 64°
Max. Birefringence:
δ = 0.038
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:
distinct to strong
Pleochroism:
Visible
Comments:
X = dark greenish blue; Y = green; Z = pale yellowish brown
Comments:
Absorption: X >> Y > Z.
Chemistry of Chestermanite
Mindat Formula:
Mg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2
Element Weights:
Crystallography of Chestermanite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 18.525(4) Å, b = 12.272(2) Å, c = 3.0218(4) Å
Ratio:
a:b:c = 1.51 : 1 : 0.246
Unit Cell V:
686.97 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Type material: Typically fibrous; rare prismatic crystals extended on [001] and flattened on {010}; predominant forms (in order of decreasing importance) are {110}, {210}, and {010}. Other forms identified: {100}, {130}, {120}, {230}, {540}, and {320}. No terminating forms were found. All crystals finely striated parallel to [011].
Comment:
Space groupP bam
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) |
|---|---|---|---|---|---|---|---|
| 0011934 | Chestermanite | Alfredsson V, Bovin J O, Norrestam R, Terasaki O (1991) The structure of the mineral chestermanite, Mg2.25Al0.16Fe0.43Ti0.02Sb0.13O2BO3. A combined single-crystal X-ray and HREM study Acta Chemica Scandinavica 45 797-804 | 1991 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.114 Å | (100) |
| 2.559 Å | (91) |
| 2.169 Å | (57) |
| 2.746 Å | (34) |
| 1.9975 Å | (32) |
| 2.475 Å | (19) |
| 1.5300 Å | (19) |
Comments:
Twin Lakes region, California, USA. Data from the type description. Data impacted by orientation effects.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 31 : Thermally altered carbonate, phosphate, and iron formations |
Type Occurrence of Chestermanite
Place of Conservation of Type Material:
Holotype specimen (80-PP-2) and cotypic material preserved at the U.S. National Museum, Washington, D.C. (NMNH 165968)
Geological Setting of Type Material:
A lens of brucite marble, ~370 m2 in area, encased in a magnetite-forsterite skarn surrounded by schists and hornfels. The metamorphosed sediments are transected by dykes and sills of granodiorite.
Associated Minerals at Type Locality:
Synonyms of Chestermanite
Other Language Names for Chestermanite
Relationship of Chestermanite to other Species
Member of:
Other Members of Orthopinakiolite Group:
| Blatterite | Sb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 | Orth. mmm (2/m 2/m 2/m) : Pnnm |
| Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 | Orth. mmm (2/m 2/m 2/m) : Pnnm |
| Takéuchiite | (Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2 | Orth. mmm (2/m 2/m 2/m) : Pnnm |
Common Associates
Associations Based on Photo Data:
| 16 photos of Chestermanite associated with Ludwigite | Mg2Fe3+(BO3)O2 |
| 13 photos of Chestermanite associated with Chondrodite | Mg5(SiO4)2F2 |
| 9 photos of Chestermanite associated with Meionite | Ca4Al6Si6O24CO3 |
| 6 photos of Chestermanite associated with Spinel | MgAl2O4 |
| 5 photos of Chestermanite associated with Brucite | Mg(OH)2 |
| 2 photos of Chestermanite associated with Calcite | CaCO3 |
| 1 photo of Chestermanite associated with Dumortierite | Al(Al2O)(Al2O)2(SiO4)3(BO3) |
Related Minerals - Strunz-mindat Grouping
| 6.AB. | Chubarovite | KZn2(BO3)Cl2 |
| 6.AB. | Rhabdoborite-(Mo) | Mg12Mo6+1.33O6(BO3)6F2 |
| 6.AB.05 | Hambergite | Be2(BO3)(OH) |
| 6.AB.10 | Berborite | Be2(BO3)(OH) · H2O |
| 6.AB.15 | Jeremejevite | Al6(BO3)5(F,OH)3 |
| 6.AB.20 | Yuanfuliite | Mg(Fe3+,Al)O(BO3) |
| 6.AB.20 | Warwickite | (Mg,Ti,Fe,Al)2O(BO3) |
| 6.AB.25 | Karlite | (Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5 |
| 6.AB.30 | Marinaite | Cu2Fe3+O2(BO3) |
| 6.AB.30 | Savelievaite | Mg2Cr3+O2(BO3) |
| 6.AB.30 | Fredrikssonite | Mg2(Mn3+,Fe3+)(BO3)O2 |
| 6.AB.30 | Vonsenite | Fe2+2Fe3+(BO3)O2 |
| 6.AB.30 | Ludwigite | Mg2Fe3+(BO3)O2 |
| 6.AB.30 | Azoproite | (Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2 |
| 6.AB.30 | Bonaccordite | Ni2Fe3+(BO3)O2 |
| 6.AB.35 | Folvikite | Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4 |
| 6.AB.35 | Pinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
| 6.AB.40 | Takéuchiite | (Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2 |
| 6.AB.40 | Blatterite | Sb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 |
| 6.AB.40 | Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
| 6.AB.45 | Aluminomagnesiohulsite | (Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2 |
| 6.AB.45 | Hulsite | Fe2+2Fe3+O2(BO3) |
| 6.AB.45 | Magnesiohulsite | Mg2Fe3+O2(BO3) |
| 6.AB.50 | Fluoborite | Mg3(BO3)(F,OH)3 |
| 6.AB.50 | Hydroxylborite | Mg3(BO3)(OH)3 |
| 6.AB.55 | Shabynite | Mg5(BO3)(OH)5(Cl,OH)2 · 4H2O |
| 6.AB.55 | Wightmanite | Mg5(BO3)O(OH)5 · 2H2O |
| 6.AB.60 | Gaudefroyite | Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3 |
| 6.AB.65 | Sakhaite | Ca48Mg16(BO3)32(CO3)16 · 2(H2O,HCl) |
| 6.AB.70 | Harkerite | Ca48Mg16[AlSi4O15(OH)]4(BO3)16(CO3)16 · 2(H2O,HCl) |
| 6.AB.75 | Pertsevite-(F) | Mg2(BO3)(F,OH) |
| 6.AB.75 | Pertsevite-(OH) | Mg2(BO3)(OH) |
| 6.AB.80 | Jacquesdietrichite | Cu2(H2BO3)(OH)3 |
| 6.AB.85 | Rhabdoborite-(V) | Mg12(V5+,Mo6+,W6+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} (x < 1) |
| 6.AB.85 | Rhabdoborite-(W) | Mg12(W6+,V5+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} |
| 6.AB.85 | Painite | CaZrAl9(BO3)O15 |
| 6.AB.90 | Mengxianminite | (Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2 |
Fluorescence of Chestermanite
No UV fluorescence
Other Information
Magnetism:
Non-Magnetic
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Chestermanite
mindat.org URL:
https://www.mindat.org/min-998.html
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References for Chestermanite
Reference List:
Alfredsson, V., Bovin, J.-O., Norrestam, R., Terasaki, O., Varma, Karikath S., Becher, Jan, Underhill, Allan E. (1991) The Structure of the Mineral Chestermanite, Mg2.25Al0.16Fe0.43Ti0.02Sb0.13O2BO3. A Combined Single-Crystal X-Ray and HREM Study. Acta Chemica Scandinavica, 45. 797-804 doi:10.3891/acta.chem.scand.45-0797
Localities for Chestermanite
Showing 1 localities.
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.
USA (TL) | |
| Erd et al. (1988) |
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Unnamed Skarn occurrence [1], Kaiser Wilderness area, Fresno County, California, USA