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