Bearthite Mineral Data

General Bearthite Information

Chemical Formula:

Ca2Al(PO4)2(OH)

Composition:

Molecular Weight = 314.09 gm

Calcium 25.52 % Ca 35.71 % CaO

Aluminum 8.59 % Al 16.23 % Al₂O₃

Phosphorus 19.72 % P 45.19 % P₂O₅

Hydrogen 0.32 % H 2.87 % H₂O

Oxygen 45.85 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Al(PO₄)₂(OH)

Environment:

In synmetamorphic quartz segregations and as an accessory mineral in high-pressure metamorphic rocks. Experimental study indicates that the stability of bearthite is restricted to v ery Ca-poor or P-rich rocks under mode

IMA Status:

Approved IMA 1993

Locality:

Found on the western ridge of the Stockhorn, Zermatt Valley, Valais, Switzerland. Link to MinDat.org Location Data.

Name Origin:

Honors Professor Peter Bearth (1902-1989), for his pioneering petrologic studies of the high-pressure terranes of the western Alps.

Name Pronunciation:

Bearthite + Pronunciation

Synonym:

ICSD 74169

IMA1986-050

PDF 45-1483

Bearthite Crystallography

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

By Intensity(I/I_o): 3.05(1), 2.867(0.61), 2.568(0.39),

Physical Properties of Bearthite

Color:

Yellow, Colorless.

Optical Properties of Bearthite

Gladstone-Dale:

CI calc= 0.49 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1026,KC= 0.201
Ncalc = 2.32

Calculated Properties of Bearthite

Electron Density:

Bulk Density (Electron Density)=6.55 gm/cc
note: Specific Gravity of Bearthite =6.59 gm/cc.

Fermion Index:

Fermion Index = 0.0005650627
Boson Index = 0.9994349373

Photoelectric:

PE_Bearthite= 4.34 barns/electron
U=PE_Bearthite x rElectron Density= 28.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bearthite is Not Radioactive

Bearthite Classification

Dana Class:

41.10.04.02 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.04)Goedkenite Group

41.10.04.01 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

41.10.04.02 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

41.10.04.03 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

41.10.04.04 Tokyoite! Ba2Mn(VO4)2(OH) P 2₁/m 2/m

Strunz Class:

08.BG.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BG -With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1

08.BG.05 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2•(H2O) P 2₁/m 2/m

08.BG.05 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

08.BG.05 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 2₁/m 2/m

08.BG.05 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 2₁/m 2/m

08.BG.05 Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2•(H2O) P 2₁,P 2₁/m Mono

08.BG.05 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

08.BG.05 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

08.BG.05 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 2₁/m 2/m

08.BG.05 Calderonite! Pb2Fe(VO4)2(OH) P 2₁/m 2/m

08.BG.05 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 2₁/m 2/m

08.BG.05 Tokyoite! Ba2Mn(VO4)2(OH) P 2₁/m 2/m

Other Bearthite Information

See Also:

Links to other databases for Bearthite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Bearthite

Ca2Al(PO4)2(OH)
Dana No: 41.10.04.02 Strunz No: 08.BG.05
Locality:

Notes:

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