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Bystrite

Named for the type locality at the Malo-Bystrinskoe lazurite deposit in the Lake Baikal area of the Eastern Siberian Region in Russia. This is the only locality for Bystrite. It occurs in a lazurite deposit with, additionally, calcite and diopside. Tabular crystals in as irregular grains and aggregates, usually a deep yellow color with a vitreous luster.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/bystrite.pdf
- Formula
- (Na,K,Ca)8(Si6Al6)O24S1.5·H2O
- Crystal System
- Trigonal
- Crystal Habit
- Tabular, Irregular Grains
- Cleavage
- Good, Poor, None
- Luster
- Vitreous (Glassy)
- Color
- yellow
- Streak
- light yellow
- Class
- Trigonal - Ditrigonal Pyramidal
- Hardness
- 5
- WebMineral
- View Bystrite
- Mindat
- View Bystrite
Bystrite from Malaya Bystraya deposit, Tunka Valley, Baikal area, Siberia, Russia

Minute yellow grains to about 0.75mm.
Bystrite from Sludyanka, Lake Baikal area, Prebaikalia, Siberia, Russia

- Special Info
- Type & Only Locality
Originally labeled as Tounkite, but actually yellow Bystrite grains with bright blue Lazurite. It is sawed on one side. Bystrite is a member of the Cancrinite group. Very rare one locality mineral.