180g / 0.397lbs / 6.35oz
2.16" x 0.98" x 2.36"
Calcite is a calcium carbonate mineral with a hardness of 3. Calcites are among the most varied and abundant crystals, and they occur in a wide variety of forms and colors. The molecular structure of the crystals is rhombohedral, but specimens can appear as scalenohedrons, rhombohedrons, prisms, masses, stalactites, etc. Calcite makes up a major part of most marbles and limestones. Calcite crystals are found on every continent.