Formula: (Ca,Na)2(Be,Al)Si2(O,OH)7
Origin of name: From locality, Jeffrey mine, Quebec, Canada
Crystal system: Orthorhombic, pseudotetragonal
Crystal class: 222
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent
Luster:
Habit: Pseudotetragonal plates to 1 mm, micaceous appearance
Hardness: 5
Specific gravity: 2.99
Cleavage: 2; {001} and {110} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Dimorphous with gugiaite
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