Calcite on Prehnite Crystal Cluster | Double Terminated Calcite | 77 grams | Mumbai, India | SO24 Morganite often with distinctive black veining

often with distinctive black veining

It often forms as prismatic crystals with a square or rectangular cross-section

This stone is frequently found with lapis lazuli

Deep purple (it's most famous)

Size: 17 mm

Calcite on Prehnite Crystal Cluster | Double Terminated Calcite | 77 grams | Mumbai, India | SO24 Morganite often with distinctive black veiningCalcite is found throughout the world in sedimentary, metamorphic, and igneous rocks. Some geologists consider it to be a "ubiquitous mineral" one that is found everywhere. Calcite is the principal constituent of limestone and marble. On this particular specimen there are 2 double terminated calcite points. Penhnite can form prismatic, tabular, or pyramidal crystals, but usually occurs in botryoidal, reniform, stalactitic, granular, or compact habits.