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Cornwallite Olivenite & Malachite

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SER870633

Cornwallite Olivenite & Malachite

Description Tabs

Description
Locality: 
Seabra, Bahia, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.1 × 2.4 × 1.8 cm
Description

some emerald green clusters of cornwallite with elongated olivenite and several tufts of malachite

Mineral Data
What's on the rock

Cornwallite

Formula: 
Cu5(AsO4)2(OH)4
Strunz: 
8.BD.05
Crystal System: 
Monoclinic
Hardness: 
4.5
Type Locality: 
Wheal Gorland, St Day United Mines (Poldice Mines), Gwennap, Camborne - Redruth - St Day District, Cornwall, England, UK

Olivenite

Formula: 
Cu2(AsO4)(OH)
Strunz: 
8.BB.30
Crystal System: 
Orthorhombic
Hardness: 
3.0
Type Locality: 
Carharrack Mine, St Day United Mines (Poldice Mines), Gwennap, Camborne - Redruth - St Day District, Cornwall, England, UK

Malachite

Formula: 
Cu2(CO3)(OH)2
Strunz: 
5.BA.10
Crystal System: 
Monoclinic
Hardness: 
3.5 - 4.0