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Arsendescloizite Willemite & Arsentsumebite

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SKY174590

Arsendescloizite Willemite & Arsentsumebite

Rare Mineral
Type Locality

Description Tabs

Description
Locality: 
Tsumeb Mine, Otavi Highlands, Namibia
Size Range: 
Micromount (under 1cm)
Size: 
0.7 × 0.5 × 0.5 cm
Description

Arsendescloizite is probably one of the Tsumeb Mine, Namibia great type locality rarities. The specimen has three crystal clusters of intergrown platy Arsendescloizite measuring to 2mm, with a pleasing high lustre yellow colour. Gemmy crystals of intergrown colourless Willemite form the host on which the Arsendescloizite has formed. The matrix is a metallic grey Chalcocite with some reddish Goethite. Arsendescloizite was described as RRR (extremely rare, single occurrence with less than 10 specimens in the Gebhard Tsumeb II book).The specimen has an old label by Keller/ Stuttgart with hand written "Neues Min." and indicating that the specimen has kasolite (RRR). This is confirmed by visual inspection under the microscope where very very small orange crystals can be seen. In addition, arsentsumebite is also present in the specimen (whitish crystals surrounding arsendescloizite, in the first photo, see analysis confirming identity of this species, eventhough it has a rare color for the species).

Mineral Data
What's on the rock

Arsendescloizite

Formula: 
PbZn(AsO4)(OH)
Strunz: 
8.BH.35
Crystal System: 
Orthorhombic
Hardness: 
4.0
Streak: 
White
Type Locality: 
Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia

Willemite

Formula: 
Zn2SiO4
Strunz: 
9.AA.05
Hardness: 
5.5
Streak: 
White
Type Locality: 
Vieille Montagne (Altenberg; Kelmisberg), Moresnet, Kelmis, Plombières-Vieille Montagne District (Plombières-Altenberg), Verviers, Liège Province, Belgium

Arsentsumebite

Formula: 
Pb2Cu(AsO4)(SO4)(OH)
Strunz: 
8.BG.05
Crystal System: 
Monoclinic
Hardness: 
4.0 - 5.0
Type Locality: 
Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia

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