Ertixiite

General Information:
 Chemical Formula:
Na2Si4O9
 Composition:
(Molecular Weight = 302.32 gm)
Sodium 15.21 % Na
Silicon 37.16 % Si
Oxygen 47.63 % O 
 Empirical Formula:
Na2Si4O9
 Environment:
Miarolytic cavites in Ta-Nb-Be pegmatites.
 IMA Status:
Approved IMA
 Locality:
Altai No. 3 pegmatite, Ertixi River, Fuyun, Xinjiang Autonomous Region, China.
 Name Origin:
Named for the locality.
Physical Properties:
 Cleavage:
None
 Color:
colorless or white.
 Density:
2.35
 Diaphaniety:
Transparent
 Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., ,
 Hardness:
5.8-6.5
 Luster:
Vitreous (Glassy)
 Streak:
white
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