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 % Al2 O3
Phosphorus 19.72 % P 45.19 % P2 O5
Hydrogen 0.32 % H 2.87 % H2 O
Oxygen 45.85 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca2 Al(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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEBearthite = 4.34 barns/electronU=PEBearthite x r Electron 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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