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Gerdtremmelite & Leadhillite

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SKY814046

Gerdtremmelite & Leadhillite

Type Locality

Description Tabs

Description
Locality: 
Tsumeb Mine, Otavi Highlands, Namibia
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.7 × 1.6 × 0.7 cm
Description

Brown crystal aggregates of the very rare Tsumeb mineral gerdtremmelite on a big tabular white leadhillite crystal.

Gerdtremmelite is an extremely rare mineral from Tsumeb!

Gerdtremmelite, that is only known from this locality worldwide, was labeled as "RRR: extremely rare: single occurrence with less than 10 specimens known" and "brown aggregates of minute crystals on the type specimen" in G.Gebhard Tsumeb II book (1999) when the mine was already closed (1996), so new discoveries will not take place in the future .

Don't miss the opportunity to get these two very sought after minerals from Tsumeb !

Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium.

Mineral Data
What's on the rock

Gerdtremmelite

Formula: 
(Zn,Fe)(Al,Fe)2(AsO4)(OH)5
Strunz: 
8.BE.40
Hardness: 
0.0
Type Locality: 
Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia

Leadhillite

Formula: 
Pb4(CO3)2(SO4)(OH)2
Strunz: 
5.BF.40
Crystal System: 
Monoclinic
Hardness: 
2.5 - 3.0
Streak: 
White
Type Locality: 
Susanna Mine (Glennery Scar Vein; Susanna Vein [Scar Vein]; Portobello Vein; Humby Vein; Lead Vein), Leadhills, South Lanarkshire, Strathclyde (Lanarkshire), Scotland, UK

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