Formula: Cu(UO2)2(SO4)2(OH)2 . 8H2O
Origin of name: For Johann Sebastian, Archduke of Austria
Crystal system: Triclinic
Crystal class: 1
Twinning: Common on {010} about [001] axis, simpler or lamellar
Unit cell: a = 16.54 Ǻ, b = 18.02 Ǻ, c = 6.84 Ǻ, α = 90.9°, β = 90.63°, γ = 110.6°
Colour: Emerald-green to greenish yellow
Diaphaneity:
Luster: Vitreous
Habit: Crystals thick tabular, elongated on c-axis, or prismatic; drusy, subparallel, or spheroidal aggregates; coatings
Hardness: 2 to 2.5
Specific gravity: 3.32
Cleavage: 1; {100} good
Tenacity:
Streak: Pale green
Synonyms/varieties:
Comments:
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