Formula: NaMg(SO4)F.2H2O
Origin of name: for after Alexandr Sergeievich Uklonskii (1882-1972), mineralogist, Academy of Sciences, Tashkent University, Tashkent, Uzbekistan, who studied central Asian mineral deposits.
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 7.202, b = 7.214, c = 5.734, β = 113.23°
Colour: Colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit: crystals prismatic, flattened, , elongated, to 2 mm, in tufts and sprays
Hardness:
Specific gravity: 2.42 to 2.5
Cleavage: 1 or more || [010]
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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