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Smithsonite On Coronadite

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Smithsonite On Coronadite

Classic Locality

Description Tabs

Description
Locality: 
Broken Hill, New South Wales, Australia
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.8 × 3.9 × 1.5 cm
Largest Crystal: 
1.30cm
Description

A fabulous contrast occurs here with white smithsonite, occuring as large doubly terminated single and intergrowing sheaf like crystals, sitting on a thick rounded crust of massive black coronadite. What look like cracks on the specimen are actually only on the surface and are due to naturally occuring shrinkage during formation.

This is a very fine miniature for the species combination and locality. There are no dings or defects anywhere. Choice Broken Hill material !

Mineral Data
What's on the rock

Smithsonite

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

Coronadite

Formula: 
Pb(Mn4+6Mn3+2)O16
Strunz: 
4.DK.05a
Hardness: 
4.5 - 5.0
Type Locality: 
Horse-Shoe shaft (Horseshoe Mine), Coronado Mine (Coronado Mining Co. property; Arizona Copper Co. group [in part]), Coronado vein, Copper Plate Gulch, Copper Mountain District (Clifton-Morenci District), Shannon Mts, Greenlee Co., Arizona, USA
Gondwana Minerals