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Lawrencite

Year of discovery: 1845 (Tazewell meteorite, USA), 1958 (Japan)

Locality list: 3 localities of lawrencite

• FeCl₂
• (Fe,Ni)Cl₂
• [Fe²⁺][Cl₂]^2-

• Class: Chloride
• Soluble in: Water
• Deliquescent
• Oxidized to Molysite.

• Fe => Mg: Chloromagnesite
• Fe => Mn: Scacchite
• Fe => Cu: Tolbachite
• Fe => Pb: Cotunnite

• [] => 2H₂O: Rokühnite (Rokuhnite)

• Color: White
• Tarnish: Green-Brown (by oxidation)
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: Soft
• Density: 3.2

• System: Trigonal
• Group: (-3)m, R(-3)m
• Lattice: a=3.6, c=17.6