Althausite Mineral Data + 
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- 41.6.5.1 Althausite Mg2(PO4)(OH,F,O) P na21 mm2
- VII/B.04-10 Althausite Mg2(PO4)(OH,F,O) P na21 mm2
- VII/B.04-20 Holtedahlite Mg12(PO3OH,CO3)(PO4)5(OH,O)6 P 31m 3m
- VII/B.04-25 Phosphoellenbergerite! Mg14(PO4)6(PO3OH,CO3)2(OH)6 P 63mc 6mm
- VII/B.04-30 Satterlyite (Fe,Mg)2(PO4)(OH) P 31m 3m
General Althausite Information |
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 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 % 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 | |||
| Empirical Formula: |
Mg2(PO4)(OH)0.6F0.3O0.1 | ||
| 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. | ||
Althausite Image | |||
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Images:
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Althausite Crystallography |
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| 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 - PyramidalH-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 |
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| Cleavage: |
[???] Perfect | ||
| Color: |
Gray. | ||
| Density: |
2.97 | ||
| Diaphaniety: |
Translucent | ||
| Hardness: |
3.5 - Copper Penny | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
white | ||
Optical Properties of Althausite |
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| 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 |
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| 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 |
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| Electron Density: |
relectron=2.96 gm/cc |
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| Fermion Index |
Fermion Index = 0.0304 Boson Index = 0.9696 |
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| Photoelectric: |
PEAlthausite = 1.61 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Althausite is Not Radioactive |
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Althausite Classification |
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| Dana Class: |
41.6.5.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen | ||
| (41.6)where (A)2 (XO4) Zq | |||
| (41.6.5)Dana Group | |||
| Strunz Class: |
VII/B.04-10 VII - Phosphates, Arsenates and Vanadates | ||
| VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds | |||
| VII/B.04 - Althausite - Satterlyite series | |||
Other Althausite Information |
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| 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris Search for Althausite using: Visit our Advertisers for Althausite : Translate Althausite Mineral Data : Ask about Althausite here : Print or Cut-and-Paste your Althausite Specimen Label here :
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