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Stilbite & Calcite

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NRW141934

Stilbite & Calcite

Ex. Repper script label, Ca. 1862.
With Antique Label

Description Tabs

Description
Locality: 
St Andreasberg District, Lower Saxony, Germany
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.4 × 4.8 × 3.2 cm
Largest Crystal: 
0.80cm
Description

Numerous colorless cubes and modified cubes of Calcite formed with colorless pearlescent Stilbite crystals. The largest Calcite crystal measures 4 mm while the longest Stilbite crystal is 8 mm. Intriguing sample from closed location and old collection: Ex. Repper script label, Ca. 1862.

Mineral Data
What's on the rock

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

Calcite

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