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Selenium & Ferroselite

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SKY756018

Selenium & Ferroselite

Rare Mineral

Description Tabs

Description
Locality: 
Repete Mine, Blanding, San Juan County, Utah, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.4 × 1 × 0.5 cm
Description

Metallic acicular selenium crystals associated to brassy crystal aggregates of the very rare iron selenide ferroselite (photos 3, 5) on a contrasting matrix.

Two selenium species in a single specimen !

Mineral Data
What's on the rock

Selenium

Formula: 
Se
Strunz: 
1.CC.10
Crystal System: 
Trigonal
Hardness: 
2.0
Streak: 
red

Ferroselite

Formula: 
FeSe2
Strunz: 
2.EB.10a
Crystal System: 
Orthorhombic
Hardness: 
6.0 - 6.5
Streak: 
Black
Type Locality: 
Ust' Uyok deposit (Ust'-Uyuk), Turan District, Tuva Republic, Eastern-Siberian Region, Russia...

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