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Smithsonite On Goethite

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KMF559734

Smithsonite On Goethite

Classic Locality

Description Tabs

Description
Locality: 
Tsumeb Mine, Otavi Highlands, Namibia
Class: 
Combination
Size Range: 
Cabinet (10-18 cm)
Size: 
10.5 × 8.5 × 5.5 cm
Description

This specimen came in a tsumeb collection that I bought from Marshall Sussman earlier this year in Tucson. Extremely heavy due to both the metallic goethite and smithsonite elements that are present in huge supply.

A fascinating combination of minerals for tsumeb that features many well defined stalactites of goethite coated by mottramite overlain with white smithsonite that have delevoped to form many huge sharp rhombs on the upper surface where they were no longer restricted by the goethite. Some mottramite casts are to be found on one side- these feature the stalactite imprints in high luster.

The surface of the rhombs is textured and exhibits the inclusion of a black mineral. This specimen is 3-D and thus offers unlimited viewing of this rare combination of minerals.

The condition is superb with no damage to the smithsonite rhombs on the top surface- all other surfaces obviously were attached to the host rock.

Mineral Data
What's on the rock

Smithsonite

Formula: 
ZnCO3
Strunz: 
5.AB.05
Hardness: 
4.0 - 4.5
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

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