Coutinhoite
Coutinhoite is an IMA-recognized mineral species in the silicate class, with the chemical formula ThₓBa₁₋₂ₓ(UO₂)₂Si₅O₁₃·3H₂O.
It crystallizes in the orthorhombic crystal system (space group Cmmb).
Key properties: Mohs hardness 2; specific gravity 3.839; Yellow streak; Waxy to silky luster; optically biaxial.
IMA symbol Cti, IMA status: approved, named in 2003.
A secondary hydrothermal mineral in a uraninite-bearing granitic pegmatite.
It is found associated with Weeksite, phosphuranylite, metauranocircite, uranocircite, on muscovite and microcline.
The mineral was named to honor José Moacyr Vianna Coutinho (b. 1924), Professor of Mineralogy and Petrography, Instituto de Geociências, Universidade de São Paulo, Brazil.
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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