Blue Calcite Sphere 100 mmLarge Blue Calcite Sphere, smoothly polished to a beautiful luster. Our Blue Calcite Sphere is a light periwinkle blue shade with subtle white clouds. Natural, undye, a bit more brilliant than the typical Blues. 100 mm Blue Calcite Sphere Blue Calcite has a Mohs hardness of 3, a specific gravity of 2. 71, and its luster is vitreous in crystallized varieties. Calming Blue Calcite is said to sooth frayed nerves and lessens anxieties. Clears negative