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Aragonite On Gypsum

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KSC619080

Aragonite On Gypsum

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Description
Locality: 
Molina de Aragón, Guadalajara, Castilla La Mancha, Spain
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 4 × 3 cm
Description

If not the biggest, those are some of biggest crystals of the species produced in the world! Aragonite is common, yet crystals of aragonite are not so common, expecially at thise size! Here we have the classic hexagonal barrel of a crystal on small matrix of gypsum! In this case, the gypsum has a contrsting salmon orange color! The crystal is doubly terminated, lustrous and translucent! A rough surface on the back is likely contact against something.

Mineral Data
What's on the rock

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

Gypsum

Formula: 
CaSO4·2H2O
Strunz: 
7.CD.40
Hardness: 
2.0
Streak: 
White.

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