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Creedite

Year of discovery: 1916 (Colorado Fluorspar mine, USA), 2018 (Japan)

Locality list: A locality of creedite

• Ca₃Al₂SO₄F₈(OH)₂,2H₂O
• [Ca²⁺₃][Al³⁺₂][SO₄|F₈|(OH)₂]^12-,2H₂O

• Class: Sulfate - Fluoride - Hydroxide - Hydrate
• Soluble in: Water

• Color: White, Purple, Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Perfect on {100} (1 plane)
• Hardness: 4
• Density: 2.7

• System: Monoclinic
• Group: 2/m, B2/b
• Lattice: a=13.9, b=8.6, c=10.0, β=94.4

Etymology: Creede quadrangle in Colorado Fluorspar mine, USA, where this mineral was first discovered.