Tsaregorodtsevite

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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