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Antlerite With Brochantite

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PCZ548895

Antlerite With Brochantite

Rare Mineral

Description Tabs

Description
Locality: 
Wheal Edward, St Just, Cornwall, United Kingdom
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
2.4 × 1.5 × 1.2 cm
Description

A nice example of a rare mineral from a classic Cornish locality. Dark to light green intergrowth of both minerals without matrix. The very dark green appears to be dark grey until viewed under a lens in natural light.  Confirmed by XRD by the British Museum a copy of which is supplied.

Mineral Data
What's on the rock

Antlerite

Formula: 
Cu3(SO4)(OH)4
Strunz: 
7.BB.15
Crystal System: 
Orthorhombic - Dipyramidal
Hardness: 
3.5
Type Locality: 
Antler Mine (Antler Gold Mine; Spuyten Duyvel Mine), Arrastra Mt., Hualapai District, Hualapai (Hualpai) Mts, Mohave Co., Arizona, USA

Brochantite

Formula: 
Cu4(SO4)(OH)6
Strunz: 
7.BB.25
Crystal System: 
Monoclinic
Hardness: 
3.5 - 4.0
Type Locality: 
Mednorudyanskoye Cu Deposit, Nizhnii Tagil, Sverdlovskaya Oblast', Middle Urals, Urals Region, Russia...
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