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Arsenate

Thometzekite

PbCu²⁺₂(AsO₄)₂·2H₂O
Hardness4.5
Crystal systemMonoclinic
ClassArsenate
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Thometzekite specimen

Thometzekite is an extremely rare mineral from Tsumeb, its type locality, and labeled as RRR in Gebhard Tsumeb book (single occurrence with less than 10 specimens) and present here as yellowish crystal aggregates in arsentsumebite matrix. The specimen has been analyzed by SEM/EDX. — Photo: David Hospital · CC BY-SA 4.0

Thometzekite

Thometzekite is an IMA-recognized mineral species in the arsenate class, with the chemical formula PbCu²⁺₂(AsO₄)₂·2H₂O.

It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Natrochalcite structural group.

Key properties: Mohs hardness 4.5; specific gravity 5.21; Earthy luster.

IMA symbol Tmz, IMA status: approved, named in 1982.

A very rare secondary mineral from an oxidized zone in a dolostone-hosted hydrothermal polymetallic ore deposit (Tsumeb, Namibia).

It is found associated with Anglesite, mimetite, gypsum (Tsumeb, Namibia).

The mineral was named to honor Wilhelm Thometzek, former General Manager of the Tsumeb mining company.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more T minerals or help write this entry.