Formula: Na2LiAlF6
Origin of name: Named after William B. "Skip" Simmons (b. 1943), University of New Orleans, New Orleans, Louisiana, U.S.A., specialist in the mineralogy and petrology of granitic pegmatites, especi ally those of Colorado and of NYF type
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 7.5006, b = 7.474, c = 7.503, β = 90.847°
Colour: Pale buff cream
Diaphaneity: Transparent to translucent
Luster: Greasy
Habit: Microscopic crystals, as inclusions in other minerals
Hardness: 2.5-3
Specific gravity: 3.05
Cleavage: None
Tenacity: Subconchoidal fracture
Streak: White
Synonyms/varieties:
Comments:
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