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Fedorovskite

Year of discovery: 1975 (Solongo deposit, Russia), 2018 (Japan)

Locality list: A locality of fedorovskite

• Ca₂Mg₂B₄O₇(OH)₆
• [Ca²⁺₂][Mg²⁺₂][(OH)₆|B₄O₇]^8-

• Class: Soro-Borate - Hydroxide

• Mn => Mg: Roweite (Series)

• Color: Brown
• Streak: Pale brown
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Perfect on {100} (1 plane)
• Hardness: 4.5
• Density: 2.7

• System: Orthorhombic
• Group: mmm, Pbam
• Lattice: a=9.0, b=13.1, c=8.2

Etymology: Mikhailovich Fedorovskii (1886 - 1956), Russian mineralogist