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Anglesite With Posnjakite Inclusions

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KMF589866

Anglesite With Posnjakite Inclusions

Classic Locality

Description Tabs

Description
Locality: 
Tsumeb Mine, Otavi Highlands, Namibia
Class: 
Combination
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.3 × 5 × 1.2 cm
Description

A massive tabular anglesite crystal from Tsumeb measuring just over 7cm from end to end and 5cm tall. It is difficult to decide what is the top- either of the narrow ends or the complex multi terminated broad side but gut feeling says that the dark inclusions were matrix related becoming increasingly clearer as it developed in size vertically?

Regardless of the inclusions- black or pale blue-green posnjakite the luster remains the same. Each broad display face features a number or sharp overlapping intergrowths within one common structure with multiple terminations. There are many gemmy areas amongst the opaque regions that you can see right through.

The condition is outstanding with some attachment related contacts only.

 

 

Mineral Data
What's on the rock

Anglesite

Formula: 
PbSO4
Strunz: 
7.AD.35
Crystal System: 
Orthorhombic
Hardness: 
2.5 - 3.0
Streak: 
Colorless
Type Locality: 
Parys Mountain Copper Mine, Anglesey, Wales, United Kingdom

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...

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