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Althausite

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Formula:
Mg4(PO4)2(OH,O)(F,☐)
System:
Orthorhombic
Colour:
Pale gray, reddish brown.
Hardness:
3½ - 4
Name:
Named in 1975 by Gunnar Raade and Magne Tysseland in honor of Prof. Egon Althaus (February 15, 1933-), mineralogist at University of Karlsruhe, Germany.
This page provides mineralogical data about Althausite.

Classification of Althausite

Approved
8.BB.25

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
B : With only medium-sized cations, (OH, etc.):RO4 about 1:1
41.6.5.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq
19.3.16

19 : Phosphates
3 : Phosphates of Be and Mg
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First Recorded Occurrence of Althausite

General Appearance of First Recorded Material:
cleavable masses and crude tabular crystals to 3 cm
Place of Conservation of First Recorded Material:
Mineralogical-Geological Museum, Oslo University, Oslo, Norway, 21978, 22044, 22045.
Year of Discovery:
1971
Geological Setting of First Recorded Material:
A serpentine-magnesite deposit
Associated Minerals at First Recorded Locality:

Physical Properties of Althausite

Sub-Vitreous, Resinous
Diaphaneity (Transparency):
Translucent
Colour:
Pale gray, reddish brown.
Comment:
turning brown on alteration to apatite
Hardness (Mohs):
3½ - 4
Tenacity:
Brittle
Cleavage:
Perfect
{010} perfect ; distinct along {110}
Density:
2.97 g/cm3 (Measured)    2.91 g/cm3 (Calculated)

Crystallography of Althausite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Space Group Setting:
Pnma
Cell Parameters:
a = 8.258(2) Å, b = 6.054(2) Å, c = 14.383(5) Å
Ratio:
a:b:c = 1.364 : 1 : 2.376
Unit Cell Volume:
V 719.06 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Rare crude crystals are elongated along [001], flattened on {010}, showing {010}, {110}, {131}, to 3 cm; generally as cleavable masses.
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.59 (100)
3.42 (40)
3.32 (90)
3.02 (80)
2.89 (40)
2.79 (60)
2.70 (30)
2.64 (60)
Comments:
29-869

Optical Data of Althausite

Type:
Biaxial (+)
RI values:
nα = 1.588 nβ = 1.592 nγ = 1.598
2V:
Measured: 70° , Calculated: 80°
Birefringence:
0.010
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively strong
Optical Extinction:
Parallel
Pleochroism:
Non-pleochroic

Chemical Properties of Althausite

Formula:
Mg4(PO4)2(OH,O)(F,☐)

Essential elements:
All elements listed in formula:

Relationship of Althausite to other Species

8.BB.05AmblygoniteLiAl(PO4)F
8.BB.05MontebrasiteLiAl(PO4)(OH)
8.BB.05TavoriteLiFe3+(PO4)(OH)
8.BB.10Triplite(Mn2+,Fe2+)2(PO4)(F,OH)
8.BB.10Zwieselite(Fe2+,Mn2+)2(PO4)F
8.BB.15SarkiniteMn22+(AsO4)(OH)
8.BB.15Triploidite(Mn2+,Fe2+)2(PO4)(OH)
8.BB.15Wagnerite(Mg,Fe2+)2(PO4)F
8.BB.15Wolfeite(Fe2+,Mn2+)2(PO4)(OH)
8.BB.15Stanĕkite(Mn2+,Fe2+,Mg)Fe3+(PO4)O
8.BB.15JoosteiteMn2+(Mn3+,Fe3+)(PO4)O
8.BB.15HydroxylwagneriteMg2(PO4)(OH)
8.BB.20HoltedahliteMg2(PO4)(OH)
8.BB.20Satterlyite(Fe2+,Mg,Fe3+)2(PO4)(OH,O)
8.BB.30AdamiteZn2(AsO4)(OH)
8.BB.30EveiteMn22+(AsO4)(OH)
8.BB.30LibetheniteCu2(PO4)(OH)
8.BB.30OliveniteCu2(AsO4)(OH)
8.BB.30ZincolibetheniteCuZn(PO4)(OH)
8.BB.30ZincoliveniteCuZn(AsO4)(OH)
8.BB.30AuriacusiteFe3+Cu2+(AsO4)O
8.BB.35ParadamiteZn2(AsO4)(OH)
8.BB.35TarbuttiteZn2(PO4)(OH)
8.BB.40BarbosaliteFe2+Fe23+(PO4)2(OH)2
8.BB.40HentscheliteCuFe23+(PO4)2(OH)2
8.BB.40Lazulite(Mg,Fe2+)Al2(PO4)2(OH)2
8.BB.40ScorzaliteFe2+Al2(PO4)2(OH)2
8.BB.40WilhelmkleiniteZnFe23+(AsO4)2(OH)2
8.BB.45TrolleiteAl4(PO4)3(OH)3
8.BB.50NamibiteCu(BiO)2(VO4)(OH)
8.BB.55PhosphoellenbergeriteMg14(PO4)6(HPO4,CO3)2(OH)6
8.BB.60UrusoviteCuAl(AsO4)O
8.BB.65TheoparacelsiteCu3(As2O7)(OH)2
8.BB.70TuraniteCu5(VO4)2(OH)4
8.BB.75StoiberiteCu5(VO4)2O2
8.BB.80FingeriteCu11(VO4)6O2
8.BB.85AverieviteCu6(VO4)2O2Cl2
8.BB.90LipscombiteFe2+Fe23+(PO4)2(OH)2
8.BB.90RichelliteCaFe23+(PO4)2(OH,F)2
8.BB.90ZinclipscombiteZnFe23+(PO4)2(OH)2
19.3.1MoraesiteBe2(PO4)(OH) · 4H2O
19.3.2BerylloniteNaBePO4
19.3.3HurlbutiteCaBe2(PO4)2
19.3.4HydroxylherderiteCaBe(PO4)(OH,F)
19.3.5GlucineCaBe4(PO4)2(OH)4 · 0.5H2O
19.3.6FransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2O
19.3.7UraloliteCa2Be4(PO4)3(OH)3 · 5H2O
19.3.9PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
19.3.10TiptopiteK2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2O
19.3.11GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2O
19.3.12RoscheriteCa2Mn52+Be4(PO4)6(OH)4 · 6H2O
19.3.13Faheyite(Mn,Mg,Na)Be2Fe2(PO4)4 · 6H2O
19.3.14FarringtoniteMg3(PO4)2
19.3.15HoltedahliteMg2(PO4)(OH)
19.3.17NewberyiteMg(HPO4) · 3H2O
19.3.18PhosphorrössleriteMg(HPO4) · 7H2O
19.3.19BobierriteMg3(PO4)2 · 8H2O
19.3.20Barićite(Mg,Fe)3(PO4)2 · 8H2O
19.3.21Panethite(Na,Ca)2(Mg,Fe2+)2(PO4)2
19.3.22Dittmarite(NH4)Mg(PO4) · H2O
19.3.23Struvite(NH4)Mg(PO4) · 6H2O
19.3.24Hannayite(NH4)2Mg3H4(PO4)4 · 8H2O

Other Names for Althausite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Althausite

Reference List:
Raade, G. & Tysseland, M. (1975): Althausite, a new mineral from Modum, Norway. Lithos. 8, 215-219

Raade, G. (1979): Althausite, a new mineral from Modum, Norway: Addendum. Lithos. 12, 288

American Mineralogist: 61: 502. [abstract]

Rømming, C. & Raade, G. (1980): The crystal structure of Althausite. American Mineralogist, 65, 488-498

Raade, G. (1996): Minerals originally described from Norway. Including notes on type material. Norsk Bergverksmuseum Skrift, 11, 104 pp. + plates 1-7

Internet Links for Althausite

Localities for Althausite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Norway
 
  • Buskerud
    • Modum
      • Overntjern
Raade, G. & Tyssedal, M. (1975): Althausite, a new mineral from Modum, Norway. LITHOS 8, 215-219; Rømming, C. & Raade, G.(1980): The crystal structure of Althausite. American Mineralogist, 65, 488-498
      • Snarum
Wilke, H.-J. (1976): Mineral-Fundstellen Band 4: Skandinavien. Chr. Weise Verlag, München, 370 pp. (p.111-113)
Raade, G. (1975): Althausite, a new mineral from Modum, Norway. LITHOS 8, 215-219 ; AmMin 86:1536]
Portugal
 
  • Castelo Branco District
    • Covilhã
      • Panasqueira
American Mineralogist, Volume 67, pages 854-860, l982
Mineral and/or Locality  
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