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Mimetite Smithsonite Quartz & Posnjakite On Galena

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KMF606387

Mimetite Smithsonite Quartz & Posnjakite On Galena

Classic Locality

Description Tabs

Description
Locality: 
Tsumeb Mine, Otavi Highlands, Namibia
Class: 
Combination
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 4 × 2.5 cm
Description

Tsumeb fans will appreciate the rarity of this association apart from its striking beauty, contrasting colors and textures.

It is evident that the galena compliment was eroded since only one complete crystal remains sheltered beneath gemmy  smithsonite- elsewhere green posnjakite deposition is telling of the galena decline by natural eroding-corroding evident in smithsonite cast formations where former galena crystals once occurred leaving only covering crusts behind.

By far the more intriguing feature is the striking mimetit/smithsonite “Morningstar” structure consisting of many spikey gem yellow crystals radiating out from the lustrous central smithsonite dome.

The fancy needle like crystals measure up to 9mm and are mostly concentrated in two major zones. To complete the association white quartz crystals can be found at one end of the matrix. There are damaged mimetite crystals yet many are damage free.- acceptable wear under these circumstances.

Mineral Data
What's on the rock

Mimetite

Formula: 
Pb5(AsO4)3Cl
Strunz: 
8.BN.05
Crystal System: 
Hexagonal
Hardness: 
3.5 - 4.0
Streak: 
White
Type Locality: 
Treue Freundschaft Mine, Johanngeorgenstadt, Johanngeorgenstadt District, Erzgebirge, Saxony, Germany

Smithsonite

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

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Posnjakite

Formula: 
Cu4(SO4)(OH)6·H2O
Strunz: 
7.DD.10
Crystal System: 
Monoclinic
Hardness: 
2.0 - 3.0
Type Locality: 
Nura-Taldy W deposit, Karagandy Province (Qaragandy Oblysy; Karaganda Oblast'), Kazakhstan...

Galena

Formula: 
PbS
Strunz: 
2.CD.10
Crystal System: 
Isometric
Hardness: 
2.5
Colour: 
Lead-grey
Streak: 
Lead-grey

Seller Information

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Seller's terms and conditions

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