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Putnisite & Millerite

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SKY661330

Putnisite & Millerite

Rare Mineral

Description Tabs

Description
Locality: 
Armstrong Mine, Widgiemooltha, Coolgardie Shire, Western Australia, Australia
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1 × 0.7 × 0.7 cm
Description

Rare new mineral approved in 2012 (IMA 2011-106) that occurs in this sample as a sharp single violet crystals associated to metallic acicular golden millerite.

The mineral is Sr-Ca-Cr sulphate-carbonate. Only two localities worldwide are known where this mineral occurs !. 

Mineral Data
What's on the rock

Putnisite

Formula: 
SrCa4Cr3+8(CO3)8SO4(OH)16·23H2O
Hardness: 
1.0 - 2.0
Streak: 
Pink
Type Locality: 
Polar Bear peninsula (Lake Cowan), Norseman, Dundas Shire, Western Australia, Australia

Millerite

Formula: 
NiS
Strunz: 
2.CC.20
Crystal System: 
Trigonal
Hardness: 
3.0 - 3.5
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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