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: Although not exceptionally pretty, this specimen has three highly interesting aspects. First, it has an unusual violet undertone, for specimens which are usually brown. Second, it shows an excellent hexagonal crystallisation with good end terminations. At the base there is a small crystal, twinned and almost at right angles with the main crystal. However, the most important feature is that the specimen comes from the Type location, after which the mineral species is named.

Location: Teruel, Aragon, Spain. (Type Location)