Metanatroautunite
Metanatroautunite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Na(UO₂)(PO₄)·3H₂O.
It crystallizes in the tetragonal crystal system (space group P4/ncc).
Key properties: Mohs hardness 2–2.5; specific gravity 3.62; Vitreous, pearly on {001} luster; optically uniaxial.
IMA symbol Mnaut, IMA status: approved, named in 1957.
Found in the oxidized zone of a uranium deposit in a granodiorite massif (Tajikistan). In a miarolitic cavity in granite (Lake Boga).
It is found associated with Schoepite, gypsum, kaolinite, “limonite” (Tajikistan); saleeite, torbernite (Lake Boga).
The prefix meta- denotes the dehydration product of “sodium autunite”, the transitory sodium analog of meta-autunite.
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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