Formula: Na4AlBeSi4O12Cl
Origin of name: after locality Tugtup agtakorfia, Greenland
Crystal system: tetragonal
Crystal class: -4
Twinning:
Unit cell:
Colour: white to light pink, rose-red, bluish, greenish, pinkish red
Diaphaneity: transparent to translucent
Luster: vitreous to greasy
Habit: massive, compact
Hardness: about 4
Specific gravity: 2.3
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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