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Chondrodite [abbr. Chn ]

Year of discovery: 1817 (Skräbböle quarry (Nordkalk quarry), Finland), 1951 (Japan)

Locality list: 16 localities of chondrodite

• Mg₅(SiO₄)₂F₂
• (Mg,Fe²⁺)₅(SiO₄)₂(F,OH)₂
• [Mg²⁺₅][F₂|(SiO₄)₂]

• Class: Humite group
• Class: Nesosilicate - Fluoride
• Soluble in: HCl (Gel residue)
• Fluorescence: UV excitation (Orange)

• F => OH: Hydroxylchondrodite

• Color: Yellowish brown
• Streak: Gray
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Indistinct on {100} (1 plane)
• Hardness: 6-6.5
• Density: 3.2

• System: Monoclinic
• Group: 2/m, P2₁/c
• Lattice: a=7.8, b=4.7, c=10.3, β=109.0