Formula: MgF2
Origin of name: for Q. Sella, Italian mining engineer
Crystal system: tetragonal
Crystal class: 4/m 2/m 2/m
Twinning: on {011}
Unit cell: a = 4.623 Å, c = 3.052 Å
Colour: colourless, white
Diaphaneity: transparent
Luster: vitreous
Habit: crystals stubby prismatic to acicular, fibrous aggregates
Hardness: 5
Specific gravity: 3.14 to 3.15
Cleavage: 2; {10} and {110} perfect
Tenacity: conchoidal, brittle
Streak:
Synonyms/varieties:
Comments: structurally related to rutile
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