2.2" Aragonite Twinned Crystal Cluster - Morocco
This is a beautiful cluster of well defined, cinnamon colored Aragonite crystals from Bou Azzer, Morocco. The translucent crystals are all twinned with pseudohexagonal (6 sided) shapes, and many of the crystals are double terminated.
Aragonite is a carbonate mineral, one of the two commonly occurring crystal forms of calcium carbonate, the other form being calcite. It is formed by biological and physical processes, including precipitation from marine and freshwater environments. It's crystal lattice differs from calcite, resulting in a different crystal shape. Aragonite forms naturally in most mollusk shells, and as the calcareous endoskeleton most corals.