Mineralogy Database

Althausite Mineral Data

Search Webmineral :

General Althausite Information

Help on Chemical  Formula: Chemical Formula: Mg2(PO4)(OH,F,O)
Help on Composition: Composition: Molecular Weight = 161.09 gm
   Magnesium   30.18 %  Mg   50.04 % MgO
   Phosphorus  19.23 %  P    44.06 % P2O5
   Hydrogen     0.38 %  H     3.36 % H2O
   Oxygen      46.68 %  O
   Fluorine     3.54 %  F     3.54 % F
                 -   %   F    -1.49 % -O=F2    
              ______        ______ 
              100.00 %       99.50 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg2(PO4)(OH)0.6F0.3O0.1
Help on Environment: Environment: In serpentine-magnesite deposits (Norway).
Help on IMA Status: IMA Status: Approved IMA 1975
Help on Locality: Locality: From the Tingelstadtjern and Overntjern quarries, Modum, Norway. In the Panasqueira Sn-W deposit, Portugal. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: To honor Professor Egon Althaus (1933- ), Karlsruhe University, Karlsruhe, Germany.
Help on Name Pronunciation: Name Pronunciation: Althausite + Pronunciation Say ALTHAUSITE

Althausite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: Grayish to maroon colored and opaque crystals of althausite on matrix.
Location: Overntjern, Buskerud, Norway. Scale: 3.2 x 5 cm.
© John Veevaert

Althausite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5741:1:0.4209
Help on Cell Dimensions: Cell Dimensions: a = 8.258, b = 14.383, c = 6.054, Z = 8; V = 719.06 Den(Calc)= 2.98
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: P na21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.593(1), 3.316(0.9), 3.024(0.8),

Physical Properties of Althausite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Gray.
Help on Density: Density: 2.97
Help on Diaphaneity: Diaphaneity: Translucent
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Althausite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1989,KPDmeas= 0.1996,KC= 0.1938
Ncalc = 1.58
Help on Optical Data: Optical Data: Biaxial (+), a=1.588, b=1.592, g=1.598, bire=0.0100, 2V(Calc)=80, 2V(Meas)=70.

Calculated Properties of Althausite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.96 gm/cc
note: Specific Gravity of Althausite =2.98 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEAlthausite = 1.61 barns/electron
U=PEAlthausite x rElectron Density= 4.77 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Althausite is Not Radioactive

Althausite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.06)where (A)2 (XO4) Zq
  (41.06.05)Dana Group Althausite Mg2(PO4)(OH,F,O) P na21 mm2
Help on  Strunz Class: Strunz Class: 08.BB.25 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BB -With only medium-sized cations, (OH, etc.):RO4 � 1:1
08.BB.25 Althausite Mg2(PO4)(OH,F,O) P na21 mm2

Other Althausite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Althausite :
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

Search for Althausite using:

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

Visit our Advertisers for Althausite :

Ask about Althausite 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 Espa�ol

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


Dana No: Strunz No: 08.BB.25





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.