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Althausite

Type Locality
Tingelstadtjern Quarry, Modum, Buskerud, Norway
Mineral Data
Mg4(PO4)2(OH,O)(F,☐)
Dimorph Of: 
Strunz: 
8.BB.25
Physical Properties
Colour: 
Pale gray, reddish brown
Crystal System: 
Orthorhombic
Hardness: 
3.5 - 4.0
Tenacity: 
brittle
Synonyms
Synonyms: 
IMA1974-050