Mineral Species
Beidellite
Type Locality
No
Composition
(Na,Ca0.5)0.3Al2(Si,Al)4O10(OH)2·nH2O
Crystal System
Monoclinic
Status at Tsumeb
Questionable
Entry Number
Species; TSNB44
General Notes
A specimen of "beidellite" as "… white crystal aggregates", apparently verified by infra-red spectroscopy, was offered for auction by Purple Sky Minerals in September 2018 (www.e-rocks.com; accessed September 2018).
Specimens of "beidellite", allegedly analysed, have also been offered for sale by Mikon Mineralienkantor (www.mikon-online.com; accessed December 2020). However, details of the analytical method were not provided.
There is no record of beidellite from Tsumeb in the peer-reviewed literature. Questionable status is retained pending reliable verification.