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Mineralpedia Details for Bystrite

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Bystrite

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┬ĚH2
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
WebMineral
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Mindat
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Bystrite from Malaya Bystraya deposit, Tunka Valley, Baikal area, Siberia, Russia

Bystrite
            from Malaya Bystraya deposit, Tunka Valley, Baikal area, Siberia, Russia

Minute yellow grains to about 0.75mm.

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Bystrite from Sludyanka, Lake Baikal area, Prebaikalia, Siberia, Russia

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.

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