Formula: Cu(UO2)2(PO4)2 . 8H2O
Origin of name: From Greek meta - after and torbernite
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 6.969 Å, c = 17.31 Å
Colour: Pale green to dark green
Diaphaneity:
Luster: Vitreous to subadamantine
Habit: Crystals thin tablets; lamellar, sheaflike or subparallel aggregates; rosettes; dehydration pseudomorphs of monoclinic torbernite
Hardness: 2.5
Specific gravity: 3.7 to 3.8
Cleavage: 1; {001} perfect
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments:
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