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RM3438   Althausite, apatite
Mg4(PO4)2(OH,O)(F,   )
#2827
Overntjern, Modum, Viken, Norway

A specimen of massive maroon coloured althausite, partly altered to apatite. Althausite may alter to apatite along the cleavage planes. This is especially typical for the althausite found at the type locality and Overntjern locality. This rare magnesium phosphate was first described from serpentine-magnesite deposits in Norway. Specimen acquired from David Shannon and from the Knut Larson collection. 3652y

Size: 4.5 x 3.7 x 3.3 cm.
Found in ±1989.
Col. K. Larson; col. E. Nicolau (Barcelona).
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