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Rameauite
Rameauite is a hydrated complex uranyl oxide mineral with formula K2Ca(UO2)6OH16·H2O〔 or K2CaU6+6O20·9H2O.〔(Handbook of Mineralogy )〕 ==Crystallography== Rameauite has four observed forms which are , , and . The angles between these faces are ^ = 58°40' and ^ = 49° 50'. The crystals are always twinned on and they are flattened parallel to , and elongated parallel to . The mineral rameauite is an example of a monoclinic mineral and appears pseudo-hexagonal. I has unit cell dimensions of: a= 13.97, b= 14.26, c= 14.22 with β = 121.02°.〔〔(Cesbron, F., W.L. Brown, P. Bariand, and J. Geffroy (1972) Rameauite and agrinierite, two new hydrated complex uranyl oxides from Margnac, France. Mineralogical Magazine, 38, 781–789. )〕
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