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Aragonite On Gypsum

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PDM642639

Aragonite On Gypsum

Description Tabs

Description
Locality: 
Tinada de los Yusos, Enguidanos, Cuenca, Castilla La Mancha, Spain
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 5.2 × 3.3 cm
Largest Crystal: 
2.60cm
Description

Prismatic crystals of aragonite, twinned cyclically on {110}, producing a pseudo-hexagonal aggregate. The lustre is good with a zone at the centre coloured purple. The group displays on a matrix of microcrystalline gypsum with a very uncommon orange colour that is also spotted with white, doubly-ended quartz crystals. The purple aragonite on orange gypsum is very aesthetic and uncommon, even for this locality.

Self-collected in 04/2011, it is free of damage.

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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