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Novákite

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JYJ572077

Novákite

Description Tabs

Description
Locality: 
Černý Důl, Krkonoše Mountain, Hradec Králové Region, Czech Republic
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.5 × 0.5 cm
Description

Grey metallic inclusions of a sulfide mineral up to 500µm, according to the label novakite, with erythrite?

The specimen comes from Černý Důl, the name of a valley, which was mined from the 14th to the 16th century for silver and iron. Minor occurences of uranium lead to further prospections in the mid of the 20th century. 

Not confirmed by analysis, erythrite not mentioned in locality list.

Mineral Data
What's on the rock

Novákite

Formula: 
Cu20AgAs10
Strunz: 
2.AA.15
Crystal System: 
Monoclinic
Hardness: 
3.0 - 3.5
Streak: 
Black
Type Locality: 
Černý Důl (Schwarzenthal), Krkonoše Mtn (Riesengebirge), Hradec Králové Region, Bohemia (Böhmen; Boehmen), Czech Republic