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Isokite

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CR47828

Isokite

Rare Mineral

Description Tabs

Description
Locality: 
Assunção Mine, Aldeia Nova, Sátão, Viseu District, Portugal
Size Range: 
Cabinet (10-18 cm)
Size: 
11 × 9 × 3.8 cm
Description

Isokite is a rare phosphate mineral usually known as grey crusts from some phosphate pegmatites.

This specimen was found recently at the Assuncao pegmatite and was the basement for a new publication with new informations and dates about this rare mineral.  In case of interest I can add the publication to the specimen.

The newly found isokite does not form whitish earthy crusts but massive brownish or greyish masses and veins in contact to triplite. Paragenesis and age relations show that Assunção isokite grows at the expense of earlier formed triplite.

Mineral Data
What's on the rock

Isokite

Formula: 
CaMg(PO4)F
Strunz: 
8.BH.10
Hardness: 
4.5 - 5.0
Type Locality: 
Nkumbwa Hill Carbonatite (Nkombwa Hill Carbonatite), Isoka, Isoka District, Muchinga Mts., Northern Province, Zambia