Formula: Ca(UO2)2[SiO3(OH)]2 . 5H2O
Origin of name: From composition and from Greek for to appear
Crystal system: Monoclinic
Crystal class: 2
Twinning: Common on {001} contact or penetration
Unit cell: a = 15.92 Ǻ, b = 7.01 Ǻ, c = 6.67 Ǻ, β = 97.3°
Colour: Pale yellow, lemon-yellow to yellowish green
Diaphaneity:
Luster: Vitreous to greasy, pearly on cleavage
Habit: Crystals prismatic, nearly square cross section, to 8 mm or acicular, hair-like; radiated or tufted aggregates; massive
Hardness: ~ 2.5
Specific gravity: 3.83
Cleavage: 1; {100} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Fluoresces weak yellowish green; luster of fibrous aggregates silky; dimorphous with uranophane
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