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Calcite & Aragonite

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PDM618067

Calcite & Aragonite

Description Tabs

Description
Locality: 
Jerada Province, Oriental Region, Morocco
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.8 × 3.7 × 0.7 cm
Description

A polished slab of an ovoid-shaped septarian nodule from the coal mines in Jerada (Morocco). The harden black argillaceous carbonate nodule has sigmoidal cracks filled up by white calcite and aragonite.

These are usually cut along the plane of the two longest directions, but this one is cut along the plane containing the longest and shortest directions.

Found in 2011, from my own collection.

Mineral Data
What's on the rock

Calcite

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

Aragonite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.15
Crystal System: 
Hexagonal
Hardness: 
3.5 - 4.0
Type Locality: 
Gallo river, Molina de Aragón, Guadalajara, Castile-La Mancha, Spain

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