Bearsite Mineral Data

Bearsite Mineral Data +

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General Bearsite Information

Chemical Formula:

Be2(AsO4)(OH)·4(H2O)

Composition:

Molecular Weight = 246.01 gm

Beryllium 7.33 % Be 20.33 % BeO

Arsenic 30.45 % As 46.71 % As₂O₅

Hydrogen 3.69 % H 32.95 % H₂O

Oxygen 58.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Be₂(AsO₄)(OH)·4(H₂O)

Environment:

Oxidation zone of a polymetallic deposit.

IMA Status:

Approved IMA 1962

Locality:

Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named for the composition (Be, Arsenic).

Synonym:

ICSD 74041

PDF 45-378

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Bearsite Crystallography

Axial Ratios:

a:b:c =0.2317:1:0.1932

Cell Dimensions:

a = 8.55, b = 36.9, c = 7.13, Z = 12; beta = 97.816° V = 2,228.58 Den(Calc)= 2.20

Crystal System:

MonoclinicSpace Group: Cc or C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 6.95(1), 3.31(0.8), 4.23(0.6),

Physical Properties of Bearsite

Color:

White.

Density:

1.8 - 2, Average = 1.9

Diaphaniety:

Translucent

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Streak:

white

Optical Properties of Bearsite

Gladstone-Dale:

CI meas= -0.108 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2264,KPDmeas= 0.2621,KC= 0.2365

Optical Data:

Biaxial (-), a=1.49, b=1.502, g=1.502, bire=0.0120

Calculated Properties of Bearsite

Electron Density:

r_electron=2.18 gm/cc
note: r_Bearsite=2.20 gm/cc.

Fermion Index

Fermion Index = 0.07355
Boson Index = 0.92645

Photoelectric:

PE_Bearsite= 20.07 barns/electron
U=PE_Bearsite x r_electron= 43.79 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bearsite is Not Radioactive

Bearsite Classification

Dana Class:

42.6.1.2 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.6)where (AB)2 (XO4) Zq · x(H2O)

(42.6.1)Dana Group

42.6.1.1 Moraesite Be2(PO4)(OH)·4(H2O) Cc,C 2/c Mono

42.6.1.2 Bearsite Be2(AsO4)(OH)·4(H2O) Cc or C 2/c Mono

Strunz Class:

VII/D.01-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, mostly cations of small size: Be, Li

VII/D.01 - Moraesite - Uralolite - Roscherite series

VII/D.01-10 Moraesite Be2(PO4)(OH)·4(H2O) Cc,C 2/c Mono

VII/D.01-20 Bearsite Be2(AsO4)(OH)·4(H2O) Cc or C 2/c Mono

VII/D.01-30 Glucine CaBe4(PO4)2(OH)4·0.5(H2O) ? Mono

VII/D.01-35 Weinebeneite CaBe3(PO4)2(OH)2·5(H2O) Cc m

VII/D.01-40 Uralolite Ca2Be4(PO4)3(OH)3·5(H2O) P 2₁/n 2/m

VII/D.01-50 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4·6(H2O) C 2/c 2/m

VII/D.01-55 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4·6(H2O) C 2/c 2/m

VII/D.01-60 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4·6(H2O) C1 1

Other Bearsite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Bearsite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Bearsite Specimen Label here :

Bearsite

Be2(AsO4)(OH)·4(H2O)
Dana No: 42.6.1.2 Strunz No: VII/D.01-20
Locality:

Notes: