Bohseite
A valid IMA mineral species
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About Bohseite
Henning Bohse
Formula:
Ca4Be3+xAl1-xSi9O25-x(OH)3+x
with x = 0 to 1; ideal formula: Ca4Be4Si9O24(OH)4
Colour:
White
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
2.719 (Calculated)
Crystal System:
Orthorhombic
Name:
Named after the Danish mineralogist Henning Bohse (1942-) who has worked for more than 40 years on the mineralogy and geology of the Ilímaussaq alkaline complex, Greenland.
Co-Type Localities:
Isostructural with:
Bavenite-Bohseite Series. Chemically similar to aminoffite (Be-rich) and somewhat to roggianite (both Be- and Al-bearing).
Redefined by IMA 2015 (IMA 14-H), with the use of material from Piława Górna, Poland (Szełęg et al., 2017): its composition is different from that of bavenite, which extends from Ca4Be2Al2Si9O26(OH)2 to Ca4Be3AlSi9O25(OH)3. Bohseite extends from Ca4Be3AlSi9O25(OH)3, the boundary between bavenite and bohseite, to the Al-free composition Ca4Be4Si9O24(OH)4.
Originally approved material (Friis et al., 2010) has the end-member composition Ca4Be3AlSi9O25(OH)3.
The bavenite-bohseite relation is described by the following substitution scheme: O(2)OH– + T(4)Si4+ + T(3)Be2+ ↔ O(2)O2– + T(4)Al3+ + T(3)Si4+.
Redefined by IMA 2015 (IMA 14-H), with the use of material from Piława Górna, Poland (Szełęg et al., 2017): its composition is different from that of bavenite, which extends from Ca4Be2Al2Si9O26(OH)2 to Ca4Be3AlSi9O25(OH)3. Bohseite extends from Ca4Be3AlSi9O25(OH)3, the boundary between bavenite and bohseite, to the Al-free composition Ca4Be4Si9O24(OH)4.
Originally approved material (Friis et al., 2010) has the end-member composition Ca4Be3AlSi9O25(OH)3.
The bavenite-bohseite relation is described by the following substitution scheme: O(2)OH– + T(4)Si4+ + T(3)Be2+ ↔ O(2)O2– + T(4)Al3+ + T(3)Si4+.
Unique Identifiers
Mindat ID:
40562
Long-form identifier:
mindat:1:1:40562:7
IMA Classification of Bohseite
Approved
IMA status notes:
Renamed by the IMA
IMA Formula:
Ca4Be3+xAl1-xSi9O25-x(OH)3+x (x = 0 to 1)
Approval history:
Originally approved by the IMA-CNMMN as IMA 2010-026, with end-member composition of Ca4Be3AlSi9O25(OH)3, holotype material was from Kangerluarsuk Fjord, the Ilímaussaq alkaline complex, Greenland.
Redefinition of its end-member composition, holotype sample and locality by the IMA-CNMNC (IMA 14-H)
Redefinition of its end-member composition, holotype sample and locality by the IMA-CNMNC (IMA 14-H)
Rather than having a new name, it seems more reasonable to redefine the end-member composition, the compositional range of bohseite, and the locality of the holotype material in accord with the data presented here. Szełęg, E. et al
Type description reference:
Szełęg, E., Zuzens, B., Hawthorne, F. C., Pieczka, A., Szuszkiewicz, A., Turniak, K., Nejbert, K., Ilnicki, S. S., Friis, H., Makovicky, E., Weller, M. T., Lemée-Cailleau, M.-H. (2017) Bohseite, ideally Ca4Be4Si9O24(OH)4, from the Piława Górna quarry, the Góry Sowie Block, SW Poland. Mineralogical Magazine, 81 (1) 35-46 doi:10.1180/minmag.2016.080.066
Classification of Bohseite
9.DF.
9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
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 |
|---|---|---|
| Bhs | 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 Bohseite
Vitreous
Transparency:
Translucent
Colour:
White
Streak:
White
Hardness:
5 - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001}; also fair, on {010}
{001}; also fair, on {010}
Parting:
not observed
Fracture:
Splintery
Density:
2.719 g/cm3 (Calculated)
Chemistry of Bohseite
Mindat Formula:
Ca4Be3+xAl1-xSi9O25-x(OH)3+x
with x = 0 to 1; ideal formula: Ca4Be4Si9O24(OH)4
with x = 0 to 1; ideal formula: Ca4Be4Si9O24(OH)4
Crystallography of Bohseite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cmcm
Setting:
Cmcm
Cell Parameters:
a = 23.183(1) Å, b = 4.9709(3) Å, c = 19.424(4) Å
Ratio:
a:b:c = 4.664 : 1 : 3.908
Unit Cell V:
2,238.43 ų (Calculated from Unit Cell)
Z:
4
Twinning:
not observed
Comment:
Parameters for the redefinition material (from Piława Górna): a=24.204, b=4.9442, c=19.418, V=2227.4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.189 Å | (28) |
| 3.727 Å | (93) |
| 3.396 Å | (34) |
| 3.347 Å | (100) |
| 3.239 Å | (79) |
| 3.120 Å | (51) |
| 3.039 Å | (28) |
| 2.561 Å | (25) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Bohseite
Co-Type Localities:
General Appearance of Type Material:
Striated plates, up to 2 mm, in fan-like or parallel aggregates up to 7 mm
Place of Conservation of Type Material:
Type material is deposited at the Mineralogical Museum, University of Wrocław, catalogue numbers: holotype: MMUWr IV7678.; cotype: MMUWr IV7679. The original material proposed as IMA 2010-026 is from the Ilímaussaq alkaline complex, South Greenland, and material is stored at the Natural History Museum in Copenhagen, Denmark (GM 1995.32) (Friis et al., 2010).
Geological Setting of Type Material:
Material used to redefinition comes from a zoned anatectic pegmatite from Piława Górna quarry, Góry Sowie Block, Poland .
Associated Minerals at Type Locality:
Reference:
Szełęg, E., Zuzens, B., Hawthorne, F. C., Pieczka, A., Szuszkiewicz, A., Turniak, K., Nejbert, K., Ilnicki, S. S., Friis, H., Makovicky, E., Weller, M. T., Lemée-Cailleau, M.-H. (2017) Bohseite, ideally Ca4Be4Si9O24(OH)4, from the Piława Górna quarry, the Góry Sowie Block, SW Poland. Mineralogical Magazine, 81 (1) 35-46 doi:10.1180/minmag.2016.080.066
Synonyms of Bohseite
Other Language Names for Bohseite
Relationship of Bohseite to other Species
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
| 5 photos of Bohseite associated with Genthelvite | Be3Zn4(SiO4)3S |
| 4 photos of Bohseite associated with Quartz | SiO2 |
| 3 photos of Bohseite associated with Fluorite | CaF2 |
| 2 photos of Bohseite associated with Hingganite-(Y) | (Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
| 2 photos of Bohseite associated with Thorite | Th(SiO4) |
| 2 photos of Bohseite associated with Microcline | K(AlSi3O8) |
| 1 photo of Bohseite associated with Ilvaite | CaFe3+Fe2+2(Si2O7)O(OH) |
| 1 photo of Bohseite associated with Bertrandite | Be4(Si2O7)(OH)2 |
Related Minerals - Strunz-mindat Grouping
| 9.DF.05 | Jimthompsonite | (Mg,Fe)5Si6O16(OH)2 |
| 9.DF.05 | Clinojimthompsonite | (Mg,Fe)5Si6O16(OH)2 |
| 9.DF.05 | Chesterite | (Mg,Fe)17Si20O54(OH)6 |
| 9.DF.15 | Ershovite | Na4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2O |
| 9.DF.15 | Paraershovite | Na3K3Fe3+2Si8O20(OH)4 · 4H2O |
| 9.DF.20 | Tvedalite | (Ca,Mn)4Be3Si6O17(OH)4 · 3H2O |
| 9.DF.25 | Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| 9.DF.30 | Bigcreekite | BaSi2O5 · 4H2O |
Fluorescence of Bohseite
none
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.
Internet Links for Bohseite
mindat.org URL:
https://www.mindat.org/min-40562.html
Please feel free to link to this page.
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Search Engines:
External Links:
References for Bohseite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2010) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) CNMNC Newsletter No 4. Mineralogical Magazine, 74 (4) 797-800 doi:10.1180/s0026461x00038925
Lussier, A. J., Hawthorne, F. C. (2011) Short-range constraints on chemical and structural variations in bavenite. Mineralogical Magazine, 75 (1) 213-239 doi:10.1180/minmag.2011.075.1.213
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter No 24. Mineralogical Magazine, 79 (2) 247-251 doi:10.1180/minmag.2015.079.2.03
Szełęg, E., Zuzens, B., Hawthorne, F. C., Pieczka, A., Szuszkiewicz, A., Turniak, K., Nejbert, K., Ilnicki, S. S., Friis, H., Makovicky, E., Weller, M. T., Lemée-Cailleau, M.-H. (2017) Bohseite, ideally Ca4Be4Si9O24(OH)4, from the Piława Górna quarry, the Góry Sowie Block, SW Poland. Mineralogical Magazine, 81 (1) 35-46 doi:10.1180/minmag.2016.080.066
Szełęg, E., Zuzens, B., Hawthorne, F. C., Pieczka, A., Szuszkiewicz, A., Turniak, K., Nejbert, K., Ilnicki, S. S., Friis, H., Makovicky, E., Weller, M. T., Lemée-Cailleau, M.-H. (2017) Bohseite, ideally Ca4Be4Si9O24(OH)4, from the Piława Górna quarry, the Góry Sowie Block, SW Poland. Mineralogical Magazine, 81 (1) 35-46 doi:10.1180/minmag.2016.080.066
Localities for Bohseite
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.
Czech Republic | |
| Ddolníček Z et al. (2020) |
Greenland (TL) | |
| Williams et al. (2010) |
Mongolia | |
| Pavel M. Kartashov analytical data 2019 |
| Pavel M. Kartashov analytical data 2019 | |
Norway | |
| Husdal (2019) |
| Kristiansen (2017) +1 other reference |
| Kristiansen (2018) | |
Poland (TL) | |
| Williams et al. (2010) +1 other reference |
| Pieczka et al. (2018) | |
Russia | |
| In coll. M. Slama (EPMA-analysed by Nikita Chukanov) |
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Tat'yana pegmatite, Mount Ulyn Khuren, Khaldzan Buragtag massif, Myangad District, Khovd Province, Mongolia