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Hemimorphite On Ankerite

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QRI784750

Hemimorphite On Ankerite

Classic Locality

Description Tabs

Description
Locality: 
San Giovanni Mine, Punta della Torre, Iglesias, Carbonia-Iglesias Province, Sardinia, Italy
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
4 × 7.4 × 5.1 cm
Largest Crystal: 
1.00cm
Weight: 
152.00gr
Description

Rich drusy featuring a thin layer of white-colorless hemimorphite encrusting (epimorphing?) brown ankerite. Locally, hemimorphite makes small spherical aggregates of crude crystals. Noteworthy the fact that ankerite crystals often appear hollow, something visible when the tip is missing due to possible reabsorption of the carbonate.

A classic paragenesis for this Sardinian locality, very representative.

Mineral Data
What's on the rock

Hemimorphite

Formula: 
Zn4Si2O7(OH)2·H2O
Strunz: 
9.BD.10
Hardness: 
4.5 - 5.0
Streak: 
White
Type Locality: 
Băiţa Mining District (Baita Bihor; Rézbánya), Nucet, Bihor Co., Romania

Ankerite

Formula: 
Ca(Fe2+,Mg)(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.0
Streak: 
White
Type Locality: 
Styrian Erzberg, Eisenerz, Styria, Austria

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