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Johannite

Year of discovery: 1821 (Elias mine, Czech)

Locality list:

• Cu(UO₂)₂(SO₄)₂(OH)₂,8H₂O
• [Cu²⁺][(UO₂)²⁺₂][(OH)₂|(SO₄)₂]^6-,8H₂O

• Class: Uranyl - Sulfate - Hydroxide - Hydrate
• Soluble in: Water (Decompose), HCl, HNO₃, H₂SO₄
• Radioactive: Very strong

• Cu => (Cu,Fe³⁺): Gilpinite

• Color: Bright green, Green
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Transparent, Translucent

• Cleavage: Good on {100} (1 plane)
• Hardness: 2-2.5
• Density: 3.3

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=16.5, b=18.0, c=6.8, α=90, β=104.2, γ=110.6