Geminite

TSNB146
Mineral
Third oxidation zoneSupergene

Mineral Species

Geminite

Type Locality

No

Composition

Cu2+(As5+O3OH).H2O

Crystal System

Triclinic

Status at Tsumeb

Confirmed

Abundance

Extremely rare

Distribution

Third oxidation zone

Paragenesis

Supergene

Entry Number

Species; TSNB146

General Notes

Geminite is named as part of the davidlloydite (type specimen) assemblage, in the third oxidation zone, probably from 44 Level (Hawthorne et al. 2012).


A specimen of a calcioandyrobertsite-like mineral (originally identified as yvonite) in the collection of the late Mark Feinglos shows associated lindackerite and very pale green transparent crystals of geminite (confirmed by Tony Kampf; Mark Feinglos pers. comm. to M. Southwood October 2019). The specimen is now in the collections at Harvard University (MGMH 2022.4.6333).

Associated Minerals

calcioandyrobertsite; davidlloydite; fraipontite; lindackerite; stranskiite; yvonite (?); zincolivenite