Althausite Mineral Data
General Althausite Information
Chemical Formula:
Mg2(PO4)(OH,F,O)
Composition:
Molecular Weight = 161.09 gm
Magnesium 30.18 % Mg 50.04 % MgO
Phosphorus 19.23 % P 44.06 % P2 O5
Hydrogen 0.38 % H 3.36 % H2 O
Oxygen 46.68 % O
Fluorine 3.54 % F 3.54 % F
- %
F -1.49 % -O=F2
______ ______
100.00 % 99.50 % = TOTAL OXIDE
Empirical Formula:
Mg2 (PO4 )(OH)0.6 F0.3 O0.1
Environment:
In serpentine-magnesite deposits (Norway).
IMA Status:
Approved IMA 1975
Locality:
From the Tingelstadtjern and Overntjern quarries, Modum, Norway. In the Panasqueira Sn-W deposit, Portugal. Link to MinDat.org Location Data.
Name Origin:
To honor Professor Egon Althaus (1933- ), Karlsruhe University, Karlsruhe, Germany.
Name Pronunciation:
Althausite + Pronunciation
Althausite Image
Images:
Althausite
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
Axial Ratios:
a:b:c =0.5741:1:0.4209
Cell Dimensions:
a = 8.258, b = 14.383, c = 6.054, Z = 8; V = 719.06 Den(Calc)= 2.98
Crystal System:
Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: P na21
X Ray Diffraction:
By Intensity(I/Io ): 3.593(1), 3.316(0.9), 3.024(0.8),
Physical Properties of Althausite
Cleavage:
{???} Perfect
Color:
Gray.
Density:
2.97
Diaphaneity:
Translucent
Hardness:
3.5 - Copper Penny
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Althausite
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
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
Electron Density:
Bulk Density (Electron Density)=2.96 gm/cc note: Specific Gravity of Althausite =2.98 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PEAlthausite = 1.61 barns/electronU=PEAlthausite x r Electron Density= 4.77 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Althausite is Not Radioactive
Althausite Classification
Dana Class:
41.06.05.01 (41) Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
(41.06) where (A)2 (XO4) Zq
(41.06.05) Dana Group
41.06.05.01 Althausite Mg2(PO4)(OH,F,O) P na21 mm2
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
References:
NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
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
15 - WWW-MINCRYST
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Althausite
Mg2(PO4)(OH,F,O)
Dana No: 41.06.05.01 Strunz No: 08.BB.25
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