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Charlesite

Year of discovery: 1983 (Franklin mine, USA), 2001 (Japan)

Locality list: A locality of charlesite

• Ca₆(Al,Si)₂(SO₄)₂B(OH)₄(OH,O)₁₂,26H₂O
• [Ca²⁺₆][(Al³⁺,Si⁴⁺)₂][(OH,O)₁₂|H₄BO₄|(SO₄)₂],26H₂O

• Class: Charlesite group
• Class: Sulfate - Nesoborate - Hydroxide - Hydrate
• Fluorescence: UV excitation (Pale purple-Green)

• Color: Colorless, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Opaque

• Cleavage: Perfect on {1010} (3 planes)
• Hardness: 2.5
• Density: 1.8

• System: Trigonal
• Group: 3m, P3₁c
• Lattice: a=11.2, c=21.2