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Formula: FeGeO6H5
Valence: Fe3+GeO6H5
Hydroxyperovskite, stottite subgroup,
non-stoichiometric perovskites group,
perovskite supergroup,
germanium-bearing mineral
Crystal system: Tetragonal
Specific gravity: 3.842 calculated
Environments
Sedimentary environments
Hydrothermal environments
Nancyrossite is a new mineral, approved in 2024 and to date (January 2026) reported only from the type
locality.
Localities
At the type locality, the Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia, nancyrossite occurs as subhedral grains
or fragments up to 0.3 mm in maximum dimension, that do not display stepped surfaces. Associated Minerals include
galena and stottite.
Nancyrossite probably formed by the oxidation and partial dehydrogenation of
stottite with which it is associated intimately
(MM 89.6.751–758, Mindat).
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