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Calcite & Stilbite

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MGR904463

Calcite & Stilbite

Classic Locality

Description Tabs

Description
Locality: 
Sarbai Deposit, Rudny, Kostanay Region, Kazakhstan
Class: 
Crystals on Matrix
Size Range: 
Museum (18cm plus)
Size: 
18.2 × 11.2 × 7.2 cm
Description

An old-time classic. Sharp terminated, translucent light yellow crystals attractively set on matrix. They are up to 50mm across, partly glossy with very attractive texture. Most crystals on matrix are not stabile, they are stabilized or come down from matrix just by a simple cleaning process. This specimen is different - tiny stilbite crystals connect calcite crystals with matrix. These pieces are very rare and exceptional. Not perfect but in fine condition overall, only the crystal at the base shows a cleavage.

Mineral Data
What's on the rock

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Stilbite

Synonym Of: 

Stilbite-Ca

Formula: 
NaCa4[Al9Si27O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0

Stilbite-Na

Formula: 
(Na,Ca,K)6-7[Al8Si28O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0
Hardness: 
3.5 - 4
Colour: 
White
Streak: 
White