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Siderite & Calcite

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CLB90755

Siderite & Calcite

Description Tabs

Description
Locality: 
Alverdissen Quarry, Alverdissen, Extertal, Detmold, North Rhine - Westphalia, Germany
Size Range: 
Small cabinet (7-10 cm)
Size: 
9 × 5.9 × 6.9 cm
Description

Very nice honey-colored calcite crystals with several clusters of tiny siderite crystals in a septarian matrix.
Some contact marks.
The quarry is famous for it's chrinoid fossils. Crystals are rather rare.
The specimen is much better in nature.

Mineral Data
What's on the rock

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

Calcite

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

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