Aragonite
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Aragonite is a carbonate mineral and one of the three most common naturally occurring crystal forms of calcium carbonate, the others being calcite and vaterite. It is formed by biological and physical
Aragonite from Los Molinillos, Cuenca, Spain, sample width about 4 cm
Hexagonal crystals (currently aragonite) from Molina de Aragón (Guadalajara), according to Torrubia (1754)
Aragonite crystals from Cuenca, Castile-La Mancha, Spain
Aragonite crystal cluster from Spain
Ammolite
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Ammolite is an organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America. It is commonly unearthed by natural erosion or through the process of various mining p
Aragonite
…bimineralic shell (aragonite plus calcite). The nacreous layer of the aragonite fossil shells of some extinct ammonites forms an iridescent material called ammolite. Aragonite also forms naturally in the endocarp of Celtis occidentalis…
Unprocessed sample of ammolite; a "dragon skin" pattern is apparent
An iridescent ammonite from Madagascar
Korite's mechanized mining operations are fairly basic, involving the excavation of shallow pits with backhoes.
Another view of Korite's open-pit mining operations in Alberta, Canada.