Bearsite (original) (raw)
A valid IMA mineral species
About BearsiteHide
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Formula:
Be2(AsO4)(OH) · 4H2O
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 IdentifiersHide
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Long-form identifier:
mindat:1:1:589:8
a58b4e81-b6c1-49f4-9993-e8bb3af07934
IMA Classification of BearsiteHide
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Type description reference:
Classification of BearsiteHide
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8.DA.05
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
20.2.1
20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| 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 BearsiteHide
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Transparency:
Transparent, Translucent
Density:
1.8 - 2.0 g/cm3 (Measured) 2.199 g/cm3 (Calculated)
Optical Data of BearsiteHide
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RI values:
_n_α = 1.490(1) _n_β =
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_n_γ = 1.502(1)
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δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Chemistry of BearsiteHide
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Mindat Formula:
Be2(AsO4)(OH) · 4H2O
Crystallography of BearsiteHide
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Crystal System:
Monoclinic
Cell Parameters:
a = 8.55 Å, b = 36.9 Å, c = 7.13 Å
β = 97.82°
Ratio:
a:b:c = 0.232 : 1 : 0.193
Unit Cell V:
2,228.56 ų (Calculated from Unit Cell)
Morphology:
Fine incrustations and tangled white fibrous aggregates of crystals
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 StructureHide
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| 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 DiffractionHide
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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 EnvironmentHide
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Type Occurrence of BearsiteHide
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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:
Reference:
Kopchenova, E.V., Sidorenko, G.A. (1962) Bearsite, the arsenic analogue of moraesite. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 91(4): 442-446.
Other Language Names for BearsiteHide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 8.DA.05 | Moraesite | Be2(PO4)(OH) · 4H2O | Mon. m : B b |
|---|---|---|---|
| 8.DA.10 | Roscherite | Ca2Mn2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/m |
| 8.DA.10 | Zanazziite | Ca2Mg5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| 8.DA.10 | Greifensteinite | Ca2Fe2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| 8.DA.10 | Atencioite | Ca2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O | Tric. 1 : _P_1 |
| 8.DA.10 | Ruifrancoite | Ca2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2O | Mon. 2/m : _B_2/b |
| 8.DA.10 | Guimarãesite | Ca2Be4Zn5(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| 8.DA.10 | Footemineite | Ca2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2O | Tric. 1 : _P_1 |
| 8.DA.10 | Okruschite | Ca2Mn2+5Be4(AsO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| 8.DA.15 | Uralolite | Ca2Be4(PO4)3(OH)3 · 5H2O | Mon. 2/m |
| 8.DA.20 | Weinebeneite | CaBe3(PO4)2(OH)2 · 4H2O | Mon. m : B b |
| 8.DA.25 | Tiptopite | K2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2O | Hex. 6 : _P_63 |
| 8.DA.40 | Spencerite | Zn4(PO4)2(OH)2 · 3H2O | Mon. 2/m : _P_2/b |
| 8.DA.45 | Glucine | CaBe4(PO4)2(OH)4 · 0.5H2O |
Other InformationHide
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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 BearsiteHide
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References for BearsiteHide
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Localities for BearsiteHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
| Brazil | |
|---|---|
| Minas Gerais Divino das Laranjeiras Linópolis ⓘ Almerindo mine | Sergio Varvello collection |
| Kazakhstan (TL) | |
| Jetisu Region Alakol District ⓘ Bota-Burum U deposit (TL) | Kopchenova et al. (1962) +1 other reference |