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Monticellite [abbr. Mtc ]

Year of discovery: 1831 (Monte Somma, Italy), 1934 (Japan)

Locality list: 7 localities of monticellite

• CaMgSiO₄
• [Ca²⁺][Mg²⁺][SiO₄]^4-

• Class: Monticellite group
• Class: Nesosilicate
• Soluble in: HCl (Gel residue)

• Ca => Mg: Forsterite

• Mg => Mn: Glaucochroite
• Mg => Fe: Kirschsteinite (Series)
• Mg => Ca: Calcio-olivine

• CaMg => Zn₂: Willemite
• CaMg => Fe₂: Fayalite
• CaMg => Ni₂: Liebenbergite
• CaMg => Mn₂: Tephroite
• CaMg => Be₂: Phenakite

• Color: Colorless, Gray, Grayish green
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Habit: Granular

• Cleavage: Indistinct on {010} (1 plane)
• Hardness: 5.5
• Density: 3.2

• System: Orthorhombic
• Group: mmm, Pnma
• Lattice: a=4.8, b=11.1, c=6.4