Formula: Ca2(Mg,Mn)2B4O7(OH)6
Origin of name: For Nikolai M. Federovskii, Russian crystallographer (1886-1956)
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 8.96, b = 13.15, c = 8.15
Colour: Brown
Diaphaneity: Transparent
Luster: Vitreous
Habit: Fibrous
Hardness: 4.5
Specific gravity: 2.65
Cleavage: 1; {100} perfect
Tenacity:
Streak: Brownish, pale brown
Synonyms/varieties:
Comments: Series with roweite
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