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Calcite On Quartz

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BMM741729

Calcite On Quartz

Description Tabs

Description
Locality: 
Herja Mine, Chiuzbaia, Baia Mare, Maramureș County, Romania
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.5 × 5.5 × 3.7 cm
Description

Black calcite from Herja is a unique and utterly appealing mineral variety. This is a nicely spherical-shaped specimen of stacked, flattened calcite rhombs. The faces are highly glossy and show a fine structure. The black color is due to inclusions of boulangerite and jamesonite which is unique for the locale. Perfectly crystallized and undamaged in combination with highly glossy, hedgehog-shaped quartz crystals. Some quartz crystals have a contact, which is hard to see with the naked eye. But the calcite is complete and undamaged, making this specimen to a really eye catcher.

Mineral Data
What's on the rock

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White