Formula: (Mg,Ca)Nb4O11·~10H2O
Origin of name: Named after Vladimir Ivanovich Ternovoi (1928–1980), economic geologist, a pioneer in studies of the Kovdor phlogopite deposit.
Crystal system: Monoclinic
Crystal class: 2/m, 2 or m
Twinning:
Unit cell: a = 20.656, b = 13.062, c = 6.338, β = 90.917°
Colour: White
Diaphaneity: Translucent
Luster: Adamantine, silky
Habit: Radial, spherical aggregates
Hardness: 3
Specific gravity: 2.95
Cleavage: None
Tenacity: Brittle fracture
Streak: White
Synonyms/varieties:
Comments:
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