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

Search for Bearthite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Chopin C , Brunet F , Gebert W , Medenbach O , Tillmanns E , Schweizerische Mineralogische und Petrographische Mitteilungen , 73 (1993) p.1-9, Bearthite, Ca2Al[PO4]2(OH), a new mineral from high-pressure terranes of the, western Alps, Locality: Dora Maira massif, western Alps, Italy

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

Search for Bearthite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Bearthite :

A Bijoux Google Search for Bearthite
Adam's Minerals Google Search for Bearthite
Cape Minerals Google Search for Bearthite
Dakota Matrix Minerals Google Search for Bearthite
Excalibur Mineral Corp. Google Search for Bearthite
Exceptional Minerals Google Search for Bearthite
John Betts Fine Minerals Search for Bearthite
McDougall Minerals Google Search for Bearthite
Mineral News Website Link
Rock and Mineral Shows Google Search for Bearthite
Weinrich Minerals, Inc. Google Search for Bearthite

Ask about Bearthite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: