Formula: N(CH3)4[Si2(Si0.5Al0.5)O6]2
Origin of name: for Sergei Tsaregorodtsev, Ukranian collector
Crystal system: orthorhombic
Crystal class: 222
Twinning:
Unit cell:
Colour: colourless to slightly yellow
Diaphaneity:
Luster: vitreous
Habit: exceptional isometric, pseudocubic crystals to 1 cm
Hardness: 6
Specific gravity: 2.04
Cleavage: none
Tenacity: white
Streak:
Synonyms/varieties:
Comments: insoluble in boiling HCl, HNO3 and H2SO4
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