Aragonite from Molina de Aragon, Spain

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Aragonite and the more common mineral Calcite are polymorphous to each other. Although Aragonite and Calcite contain the same chemical composition, they differ in crystal structure. Aragonite forms orthorhombic crystals, whereas Calcite forms trigonal crystals. These 2 specimens look totally different from one another, yet if you look at the smaller piece, it has heaps of orthorhombic crystals compared to the single orthorhombic crystal with the bigger piece.

I acquired a small light brown round piece from Crystal Castle when on a road trip up to Byron Bay around Easter of 2015. The chunky specimen came from Greg at Blue Gems at the August 2016 Sydney Crystal Show.

Specimen Details

Chemical Formula: CaCO3

ID #: JG0004, JG0022

Colour: Clear to light brown

Hardness: 3.5 – 4

Acquisition Date: 06/08/2016, 05/04/2015

Crystal System: Orthorhombic

Lustre: Vitreous, dull

Dimensions: 45mm x 35mm x 30mm
60mm x 50mm x 35mm

Weight: 98g, 69g

Location: Molina de Aragon, Spain

Rarity of Mineral

Common

Did you know!?
Aragonite frequently contains sand inclusions, which give specimens a brown colour.

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