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Hiortdahlite

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Watches:
RSL694663

Hiortdahlite

Description Tabs

Description
Locality: 
San Vito Quarry, Ercolano, Monte Somma, Somma-Vesuvius, Naples, Campania, Italy
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.3 × 2.5 × 2 cm
Description

Very sharp crystal of hiortdahlite in sanidinite matrix. Translucent, uniform yellow color and showing prism and terminal faces. Actually, the Somma-Vesuvius "hiortdahlite" crystals (also known as "guarinite") are made up of domains of various mineral phases (hiortdahlite polytypes, wöhlerite, låvenite).

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