Formula: NaCs(Be,Li)Zr2(PO4)4 . 1-2 H2O
Origin of name: For McCrillis family, American pegmatite miners
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell:
Colour: Colourless to white
Diaphaneity: Translucent to transparent
Luster: Vitreous
Habit: Bipyramidal crystals to 1.2 mm
Hardness: 4 to 4.5
Specific gravity: 3/125
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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