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Chesterite [abbr. Chs ]

Year of discovery: 1978 (Carlton mine, USA), 1991 (Japan)

Locality list: 3 localities of chesterite

• Mg₁₇Si₂₀O₅₄(OH)₆
• (Mg,Fe²⁺)₁₇Si₂₀O₅₄(OH)₆
• [Mg²⁺₁₇][(OH)₆|(Si₁₀O₂₇)₂]^34-

• Class: Inosilicate (Single chain) - Hydroxide

• Color: Colorless, Pale brown
• Streak: White
• Luster: Silky
• Diaphaneity: Transparent

• Cleavage: Perfect on {110} (2 planes)
• Hardness: 2-2.5
• Density: 3.2

• System: Orthorhombic
• Group: mm2, A2₁ma
• Lattice: a=18.6, b=45.3, c=5.3