Cuprosklodowskite

Formula:  (H₃O)₂Cu(UO₂)₂(SiO₄)₂ ^. 2H₂O

Origin of name:  From copper and sklodowskite

Crystal system:  Triclinic

Crystal class:  -1

Twinning:

Unit cell: a = 9.21 Å, b = 6.63 Å, c = 7.06 Å, α = 90°, β = 110°, γ = 108.5°

Colour:  Yellow-green, olive green, pale green to emerald green

Diaphaneity:

Luster:  Subvitreous to dull or silky

Habit:  Crystals acicular, elongated along c axis; silky coatings with radial-fibrous or matted fibrous structure

Hardness:  4

Specific gravity: 3.85

Cleavage:  1; {100} distinct

Tenacity:

Streak:

Synonyms/varieties:

Comments:  Radioactive