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O'Danielite & Stranskiite

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SKY523738

O'Danielite & Stranskiite

Type Locality

Description Tabs

Description
Locality: 
Tsumeb Mine, Otavi Highlands, Namibia
Class: 
Crystals on Matrix
Size Range: 
Micromount (under 1cm)
Size: 
0.5 × 0.3 × 0.1 cm
Description

Very small pale green crystal aggregates of the extremely rare Tsumeb mineral o'danielite associated to nice blue crystals of stranskiite in a matrix of quartz. 

O'danielite is one of the rarest minerals from Tsumeb which is the type and only known locality worldwide. Analyzed specimen see copy attached in the "analysis section", where it shows that is a Mg-free and Fe,Cu rich O'danielite, since Mg is not an essential element for O'danielite, so the formula of this specimen should be Na(Zn,Fe,Cu)3 H2(AsO4)3.
O'danielite was labeled as RRR ! in Gebhard Tsumeb II book (single specimen).

Stranskiite, that is also an extremely rare mineral from Tsumeb, was found in 1957 in the 30th level of the mine with only one specimen known for a long time (almost 40 years !). it is also analyzed (see analysis enclosed). Ex-Excalibur Mineral Company specimen with label enclosed (see photo attached), that will be sent to the buyer. The mineral was labeled as RRR (extremely rare, single occurrence with less than 10 specimens known) in Gebhard 1999 Tsumeb II book.
 

Mineral Data
What's on the rock

O'Danielite

Formula: 
Na(Zn,Mg)3H2(AsO4)3
Hardness: 
4.0 - 0.0
Type Locality: 
Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia

Stranskiite

Formula: 
Zn2Cu(AsO4)2
Strunz: 
8.AB.35
Hardness: 
4.0 - 0.0
Colour: 
Cyan-blue
Type Locality: 
Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia
Analysis
Analysis Report - only: O'Danielite & Stranskiite
Analysis Report - only: O'Danielite & Stranskiite
Analysis Report - only: O'Danielite & Stranskiite
Labels
Label Images - only: O'Danielite & Stranskiite

Seller Information

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