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Holtedahlite

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MCH171452

Holtedahlite

Rare Mineral

Description Tabs

Description
Locality: 
Tingelstadtjern Quarry, Modum, Viken, Norway
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 4.5 × 2.7 cm
Description

A nodule of colourless, glassy holtedahlite with inclusions of hematite is embedded in slightly pinkish althausite in a rock consisting of greenish apatite, green lizardite and pinkish althausite.

Comes with a label of Torgeir Garmo´s Fossheim steinsenter, Lom, Norway.

A very good specimen of this rare mineral from it's type locality.

Mineral Data
What's on the rock

Holtedahlite

Formula: 
Mg2(PO4)(OH)
Strunz: 
8.BB.20
Crystal System: 
Trigonal
Hardness: 
4.5 - 5.0
Colour: 
Colourless
Type Locality: 
Tingelstadtjern Quarry, Modum, Buskerud, Norway
Dimorph Of: 

Althausite

Formula: 
Mg4(PO4)2(OH,O)(F,☐)
Strunz: 
8.BB.25
Hardness: 
3.5 - 4.0

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