Bearsite
A valid IMA mineral species
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About Bearsite
Formula:
Be2(AsO4)(OH) · 4H2O
Colour:
White
Lustre:
Silky
Specific Gravity:
1.8 - 2.0
Crystal System:
Monoclinic
Name:
For the chemical composition, which includes BEryllium and ARSenic.
The arsenic analogue of Moraesite
Unique Identifiers
Mindat ID:
589
Long-form identifier:
mindat:1:1:589:8
Similar Names
| Barićite | A valid IMA mineral species | (Mg,Fe)3(PO4)2 · 8H2O |
| Beresite | A rock classification type | |
| Bieirosite | A synonym of Beudantite | |
| Brassite | A valid IMA mineral species | Mg(HAsO4) · 4H2O |
| Brossite | A variety of 'Iron-bearing Dolomite' [Dolomite] | Ca(Mg,Fe)(CO3)2 |
| Bursaite | A discredited species name | Pb5Bi4S11 (?) |
IMA Classification of Bearsite
Approved
IMA Formula:
Be2As5+O4(OH)·4H2O
First published:
1962
Classification of Bearsite
8.DA.05
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
A : With small (and occasionally larger) cations
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
A : With small (and occasionally larger) cations
42.6.1.2
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq·xH2O
20.2.1
20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
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 |
|---|---|---|
| Bea | 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 Bearsite
Silky
Transparency:
Transparent, Translucent
Colour:
White
Streak:
White
Density:
1.8 - 2.0 g/cm3 (Measured) 2.199 g/cm3 (Calculated)
Optical Data of Bearsite
Type:
Biaxial (-)
RI values:
nα = 1.490(1) nβ = ~1.502 nγ = 1.502(1)
Max. Birefringence:
δ = 0.012
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
none
Comments:
Z∧c = 8-10°
Chemistry of Bearsite
Mindat Formula:
Be2(AsO4)(OH) · 4H2O
Element Weights:
Elements listed:
Crystallography of Bearsite
Crystal System:
Monoclinic
Cell Parameters:
a = 8.55 Å, b = 36.9 Å, c = 7.13 Å
β = 97.82°
β = 97.82°
Ratio:
a:b:c = 0.232 : 1 : 0.193
Unit Cell V:
2,228.56 ų (Calculated from Unit Cell)
Z:
12
Morphology:
Fine incrustations and tangled white fibrous aggregates of crystals
tenths to hundredths of a millimeter in size.
tenths to hundredths of a millimeter in size.
Comment:
Point Group: 2/m or m; Space Group: [C2/m or Cc] (by analogy to moraesite).
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
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CIF File Best | x | y | z | a | b | c
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Labels
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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) |
|---|---|---|---|---|---|---|---|
| 0012708 | Bearsite | Harrison W T A, Nenoff T M, Gier T E, Stucky G D (1993) Tetrahedral-atom 3-ring groupings in 1-dimensional inorganic chains: Be2AsO4OH*4H2O and Na2ZnPO4OH*7H2O Inorganic Chemistry 32 2437-2441 | 1993 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.95 Å | (100) |
| 3.31 Å | (80) |
| 4.23 Å | (60) |
| 3.02 Å | (60) |
| 2.88 Å | (50) |
| 2.145 Å | (50) |
| 1.956 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Bearsite
General Appearance of Type Material:
Fine incrustations and tangled white fibrous aggregates of crystals tenths to hundredths of a millimeter in size.
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia
Associated Minerals at Type Locality:
Other Language Names for Bearsite
Common Associates
Related Minerals - Strunz-mindat Grouping
| 8.DA.05 | Moraesite | Be2(PO4)(OH) · 4H2O |
| 8.DA.10 | Zanazziite | Ca2Mg5Be4(PO4)6(OH)4 · 6H2O |
| 8.DA.10 | Atencioite | Ca2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O |
| 8.DA.10 | Guimarãesite | Ca2Be4Zn5(PO4)6(OH)4 · 6H2O |
| 8.DA.10 | Footemineite | Ca2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2O |
| 8.DA.10 | Greifensteinite | Ca2Fe2+5Be4(PO4)6(OH)4 · 6H2O |
| 8.DA.10 | Roscherite | Ca2Mn2+5Be4(PO4)6(OH)4 · 6H2O |
| 8.DA.10 | Ruifrancoite | Ca2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2O |
| 8.DA.10 | Okruschite | Ca2Mn2+5Be4(AsO4)6(OH)4 · 6H2O |
| 8.DA.15 | Uralolite | Ca2Be4(PO4)3(OH)3 · 5H2O |
| 8.DA.20 | Weinebeneite | CaBe3(PO4)2(OH)2 · 4H2O |
| 8.DA.25 | Tiptopite | K2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2O |
| 8.DA.40 | Spencerite | Zn4(PO4)2(OH)2 · 3H2O |
| 8.DA.45 | Glucine | CaBe4(PO4)2(OH)4 · 0.5H2O |
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 Bearsite
mindat.org URL:
https://www.mindat.org/min-589.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Bearsite
Reference List:
IMA (1967) International Mineralogical Association: Commission on New Minerals and Mineral Names. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (277) 131-136 doi:10.1180/minmag.1967.036.277.20
Harrison, William T. A., Nenoff, Tina M., Gier, Thurman E., Stucky, Galen D. (1993) Tetrahedral-atom 3-ring groupings in 1-dimensional inorganic chains: beryllium arsenate hydroxide hydrate (Be2AsO4OH·4H2O) and sodium zinc hydroxide phosphate hydrate (Na2ZnPO4OH·7H2O) Inorganic Chemistry, 32 (11) 2437-2441 doi:10.1021/ic00063a039
Localities for Bearsite
Showing 2 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.
Brazil | |
| Sergio Varvello collection |
Kazakhstan (TL) | |
| Kopchenova et al. (1962) +1 other reference |
Quick NavTopAbout BearsiteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Almerindo claim, Linópolis, Divino das Laranjeiras, Minas Gerais, Brazil