Metavandendriesscheite
Metavandendriesscheite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula PbU₇O₂₂·nH₂O.
Key properties: specific gravity 5.45; optically biaxial.
IMA symbol Mvdd, grandfathered status — known before the IMA’s founding, named in 1960.
Found in the oxidized zone of a uranium-bearing mineral deposit.
It is found associated with Vandendriesscheite, fourmarierite, becquerelite, metatorbernite, rutherfordine, uraninite.
As a dehydration product of vandendriesscheite.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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