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Dolomite On Goethite

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RPL654968

Dolomite On Goethite

Description Tabs

Description
Locality: 
Old Ham Mine, Clearwell, Forest of Dean, Gloucestershire, United Kingdom
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
4 × 7.2 × 1.8 cm
Largest Crystal: 
0.00cm
Weight: 
100.00gr
Description

A nice example of goethite as parallel stalactites known as “brush ore" completely covered in brown rhombs of dolomite and a few calcites.

 

Previous labels supplied (not photographed)
Mineral Data
What's on the rock

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White

Goethite

Formula: 
α-Fe3+O(OH)
Strunz: 
4.00.
Crystal System: 
Orthorhombic
Hardness: 
5.0 - 5.5
Type Locality: 
Hollertszug Mine (Hollerter Zug Mine), Dermbach, Herdorf, Siegerland, Rhineland-Palatinate, Germany
Provenance

Pearl Freeman Collection

Wed, 2015-07-22 22:52 -- admin
Some History
Dates: 
Post War- 
2011
Type: 
Collector/Collection
Specialisms: 
Baryte, United Kingdom, Peru, Sulphides
About

Pearl and her husband Sid were enthusiastic mineral collectors for several decades; Pearl was also long time treasurer of the British...

Seller Information

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