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Bystrite & Lazurite

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SKY888442

Bystrite & Lazurite

Rare Mineral

Description Tabs

Description
Locality: 
Malo-Bystrinskoe, Malaya Bystraya River Valley, Lake Baikal, Irkutsk Oblast, Russian Federation
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 1.5 × 1.5 cm
Description

Bright-yellow grains of bystrite associated to blue lazurite in white calcite matrix from the type locality for both species.

Bystrite and lazurite are very rare silicates. 

Ex Vandenbroucke Museum collection from Waregem, Belgium.

Very nice under the microscope !

Mineral Data
What's on the rock

Bystrite

Formula: 
(Na,K)7Ca(Al6Si6O24)(S3)1.5·H2O
Strunz: 
9.FB.05
Crystal System: 
Hexagonal
Hardness: 
5.0
Colour: 
yellow
Type Locality: 
Malo-Bystrinskoe lazurite deposit, Malaya Bystraya River Valley, Slyudyanka (Sludyanka), Lake Baikal area, Irkutskaya Oblast', Prebaikalia (Pribaikal'e), Eastern-Siberian Region, Russia...

Lazurite

Variety Of: 

Haüyne

Formula: 
(Na,Ca)4-8(Al6Si6O24)(SO4,S,Cl)1-2
Strunz: 
9.FB.10
Hardness: 
5.5 - 6.0
Formula: 
Na6 Ca2(Al6Si6O24)(SO4,S,S2, S3,Cl,OH)2
Strunz: 
9.FB.10
Crystal System: 
Isometric
Hardness: 
5.0 - 5.5
Type Locality: 
Ladjuar Medam (Lajur Madan; Lapis-lazuli Mine; Lapis-lazuli deposit), Sar-e Sang (Sar Sang; Sary Sang), Koksha Valley (Kokscha Valley; Kokcha Valley), Khash & Kuran Wa Munjan Districts, Badakhshan Province (Badakshan Province; Badahsan Province), Afghanistan

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