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Hiortdahlite

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MCH567461

Hiortdahlite

Rare Mineral

Description Tabs

Description
Locality: 
Stokkøya, Langesundsfjorden, Larvik, Vestfold og Telemark, Norway
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.3 × 5 × 4.5 cm
Description

Numerous dark yellow coloured crystals of Hiortdahlite I are embedded in a matrix of mainly microcline with some nepheline and dark mica. The hiortdahlite I crystals reach a lenght of up to 1 cm and are partially well developped. Very good specimen for this rare mineral species.

Mineral Data
What's on the rock

Hiortdahlite

Formula: 
(Ca,Na)3(Zr,Ti)(Si2O7)(O,OH,F)2
Strunz: 
9.BE.17
Crystal System: 
Triclinic
Hardness: 
5 - 5½
Colour: 
Yellow, yellowish-brown

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