Mineral Species: Aragonite

Chemical Formula: CaCO3

Chemical Name: Calcium Carbonate

Mineral Class: Carbonate

Mineral Notes: Aragonite has the same chemical composition as Calcite. However the way that atoms are arranged in the crystal is different and for this reason Aragonite crystallises in the orthorhombic system. Aragonite also has another popular habit called Floss Ferri or "flowers of iron". This is a branching form that can make delicate tree or coral-like formations that are very beautiful. A steep pyramidal habit forms clusters of sharp spiked crystals sometimes referred to as a "church steeple" habit.

Description: A superb twinned cluster of hexagonal Aragonite. Both crystals' ends are terminated. The front faces show twinning, where several other part-crystals emerge. An extremely attractive display specimen.

Location: Molina de Aragon, Spain (Type Location).