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Stichtite

Year of discovery: 1910 (Dundas, Australia), 2016 (Japan)

Locality list: A locality of stichtite

• Mg₆Cr₂(CO₃)(OH)₁₆,4H₂O
• [Mg²⁺₆][Cr³⁺₂][(OH)₁₆|CO₃]^18-,4H₂O

• Class: Carbonate - Hydroxide - Hydrate

• Cr => Mn: Desautelsite
• Cr => Fe: Pyroaurite, Sjögrenite(Sjogrenite)
• Cr => Al: Manasseite, Hydrotalcite

• Color: Purple, Pink
• Streak: Pale purple
• Luster: Resinous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: 1.5-2
• Density: 2.2

• System: Hexagonal (2H₁), Trigonal (3R₁) (Layer-stacking polytype)
• Group (2H): 6/mmm, P6₃/mmc
• Group (3R): (-3)m, R(-3)m
• Lattice (2H): a=6.2, c=15.5
• Lattice (3R): a=6.2, c=46.4