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Coquimbite

Year of discovery: 1841 (Coquimbo region, Chile), 1958 (Japan)

Locality list: 4 localities of coquimbite

• Fe₂(SO₄)₃,9H₂O
• (Fe,Al)₂(SO₄)₃,9H₂O
• [Fe³⁺₂][(SO₄)₃]^6-,9H₂O

• Class: Sulfate - Hydrate
• Soluble in: Water, HCl, HNO₃, H₂SO₄
• Taste: Astringent
• Dehydrate to white powder under dry condition.

• Polymorph: Paracoquimbite (Trigonal)

• Color: Pale green, Pale blue
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Inperfect on {1011} (3 planes)
• Hardness: 2.5
• Density: 2.1

• System: Trigonal
• Group: (-3)m, P(-3)1c
• Lattice: a=10.9, c=17.1