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Dolomite On Quartz

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QRI648904

Dolomite On Quartz

Classic Locality

Description Tabs

Description
Locality: 
Cavnic Mine, Maramureș County, Romania
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
6.7 × 11.6 × 3.8 cm
Weight: 
258.00gr
Description

Elegant cabinet of creamy dolomite partially epimorphing a drusy of milky quartz. Quartz crystals feature the classic hydrothermal shape, typical for Cavnic, and have great lustre. The bottom of the specimen is given by a thin crusty mixture of sulfide (chalcopyrite and dark sphalerite) and quartz.
One of the typical features of these drusies is the fact that the epimorphs were mostly oriented, as it would appear that the later carbonate mineralization would come only from one direction. This is especially the case with Cavnic specimens, and it is evident in the pictures.

An absolute classic from Romania, nowadays increasingly rare and hard to find in good conditions. Obtained in the early 2000s at an Italian mineral show by an old Romanian dealer.

Mineral Data
What's on the rock

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White

Quartz

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

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