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GPM1166111

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Description

Locality:

Příbram District, Central Bohemian Region, Czech Republic

Class:

Crystals on Matrix

Size Range:

Small cabinet (7-10 cm)

Size:

7.4 × 6.1 × 4.7 cm

Description

This specimen features the primary uranium mineral, uraninite, in its most iconic botryoidal (globular) habit. Known traditionally as "pitchblende" for its pitch-black colour and greasy-to-submetallic lustre, the uraninite forms a dense, undulating crust across a contrasting pale crystalline matrix (likely calcite or dolomite).

The specimen showcases the typical hydrothermal vein mineralisation of the Příbram district, with the black uraninite aggregates displaying a fine-grained, velvety texture upon close inspection. The sharp boundary between the dark radioactive mineral and the lighter host rock makes for a highly dramatic and educational display piece.

r_001

Collected:

2008

Mineral Data

What's on the rock

Uraninite

Formula:

UO₂

Strunz:

4.DL.05

Crystal System:

Isometric

Hardness:

5.0 - 6.0

Type Locality:

Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

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GeoPeak Minerals

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