Formula: Na(REE,Ca)2F6
Origin of name: For Dr. Ihor Stephan Zajac (1935- ), the geologist who lead the exploration group that discovered the Strange Lake deposit and who first recognized the mineral.
Crystal system: Hexagonal
Crystal class: -3
Twinning:
Unit cell: a = 6.099, c = 11.064
Colour: Colourless to pale pink
Diaphaneity: transparent
Luster: Vitreous
Habit: Anhedral grains 1-2 mm across
Hardness: 3.5
Specific gravity: 4.44
Cleavage:
Tenacity: Brittle, conchoidal fracture
Streak: White
Synonyms/varieties:
Comments: slowly soluble in hot HCl
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