Aragonite – flos ferri calcium carbonate

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Description

Aragonite flos ferri – means “flowers of iron.”

Mineral Group carbonate
Composition calcium carbonate, CaCO3
Origin Mexico
dimension 5.5×4.5×2.5 cm
weight 29g

A specimen of aragonite formed as a large flower-like cluster of clear and white crystals. The crystals are sharp, with multiple terminations

Beautiful bushy aragonite aggregates up to several decimetres in size have been found at Podrecany in Slovakia; they are as popular among collectors as are crystalline specimens.

This is a carbonate mineral, one of the two most common, naturally occurring, crystal forms of calcium carbonate, CaCO3 (the other form being the mineral calcite). It is formed by biological and physical processes, including precipitation from marine and freshwater environments.

see Wikipedia

and minerals.net

Calcium carbonate forms as both Aragonite and Calcite and these two minerals only differ in their crystallisation. Calcite, the more common mineral, forms in trigonal crystals, whereas Aragonite forms orthorhombic crystals. On occasion, crystals of both minerals are too small to be individually determined, and it is only possible to distinguish these two minerals with optical or x-ray testing. The true identity of microcrystalline forms of each may also not be known without complex testing, and this can also cause a confusion between these speci

Additional information

Weight 29 g
Dimensions 5.5 x 4.5 x 2.5 cm