Brown Aragonite Sphere | 67 mm, 2.6 in | 427 grams Heulandite Product ID: MGPK3643

Product ID: MGPK3643

Product ID: SS0318

Clarity: Top crystal

Some better-preserved specimens have features similar to modern squid

Brown Aragonite Sphere | 67 mm, 2.6 in | 427 grams Heulandite Product ID: MGPK3643The principal member of the Aragonite Group, aragonite is the second most common polymorph of natural calcium carbonate (the most common is calcite). It is significantly less widespread and abundant than calcite and is formed under a much narrower range of physiochemical conditions. It is metastable relative to calcite and often converts to calcite accompanying changes in the environment. It is nearly always a low temperature, near surface mineral.