Formula: NaCa2Al4(CO3)4(OH)8Cl
Origin of name: after locality Tunisia
Crystal system: tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 11.22, c = 6.582
Colour: colourless to white
Diaphaneity: Transparent to translucent
Luster:
Habit: crystals tabular, small, fine-grained aggregates
Hardness: 3.5-4.5
Specific gravity: 2.51
Cleavage: 2; basal and prismatic good
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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