Formula: SrAlF4(OH).H2O
Origin of name: for Igor Tikhonenkov (1927-1961), Russian mineralogist, studied alkaline rocks and minerals
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 8.73, b = 10.62, c = 5.02, β = 102.43°
Colour: Colourless to slightly rosy when included with iron oxides
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals combinations of prisms, to 5 mm
Hardness: 3.5
Specific gravity: 3.26
Cleavage: 1; {001} perfect
Tenacity: Conchoidal to irregular fracture
Streak: White
Synonyms/varieties:
Comments: dimorphous with acuminite. Found in iron ores.
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