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Analcime & Calcite

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JYJ757324

Analcime & Calcite

Description Tabs

Description
Locality: 
Duingen Clay Pit, Alfeld, Hildesheim, Lower Saxony, Germany
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
13 × 10 × 6 cm
Description

Beautiful sharp analcime with brown calcite from the clay-pit Duingen, Alfeld. 

Historic specimen. 

Mineral Data
What's on the rock

Analcime

Formula: 
Na2(Al2Si4O12)·2H2O
Strunz: 
9.GB.05
Crystal System: 
Triclinic
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Cyclopean Islands, Acitrezza (Aci Trezza), Etna Volcanic Complex, Catania Province, Sicily, Italy

Calcite

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