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Olivenite & Birnessite

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SMM913194

Olivenite & Birnessite

Ex George Fletcher Collection
Classic Locality

Description Tabs

Description
Locality: 
Penberthy Croft Mine, St Hilary, Cornwall, United Kingdom
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 2 × 2.5 cm
Description

Clusters of glassy green diverging crystals along with black masses of birnessite from a classic Cornish location.
Comes with a handwritten adhesive label describing the year of discovery, acquisition and also the collector's name but I haven't been able to figure this out for sure.

Boxed with Label
Mineral Data
What's on the rock

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

Birnessite

Formula: 
(Na,Ca)0.5(Mn4+,Mn3+)2O4·1.5H2O
Strunz: 
4.FL.45
Crystal System: 
Orthorhombic
Hardness: 
1.5
Type Locality: 
Birness, Ellon, Buchan Grampian (Aberdeenshire), Scotland, UK
Provenance

George Fletcher Collection

Tue, 2015-09-29 15:51 -- admin
Some History
Name: 
George Fletcher
Dates: 
present
Type: 
Collector/Collection
Specialisms: 
Derbyshire/Midlands, Weardale, United Kingdom
About

George Fletcher lives, worked and collected a lot in the Derbyshire, Peak distrct however as a prolific collector travelled all over the...

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