Calcite is the mineralogical name for calcium carbonate.
Mollusks use the calcium carbonate from sea water to build their shells, which geologicaly become limestone. Here is where you can see the water cycle in mineral form. Rainwater washes over the limestone, causing it dissolve very gradually, and then filters through the layers of the earth until it dries in caves, cracks in other stone formations, etc. until you have this:
(circumstances permitting, of course) Compressed by time and great weight, limestone becomes marble.
Calcite is a very common mineral, found on every continent. It's a component of limestone, marble, and many other stones. I'm discussing it now because it forms the white lines in lower grade Lapis Lazuli and Sodalite. It is the most stable polymorph of calcium carbonate, other forms collapse into calcite when heated or put under pressure.
Calcite occurs in a rainbow of colors, depending on other other elements water picks up along the way. It's translucency is quite variable- from clear to milky. The crystal structure splits light, a clear prism will produce a double reflection of an image.
In metaphysical qualities it's somewhat similar to quartz-magnifying and focusing, but, to me, it feels much more dull and subtle. It's light splitting quality is sometimes used to double the potential of intent.
Particular uses vary by color: Clear for calming and correcting your perspective, blue for soothing, green releases stress and heals, orange for creative energy, honey yellow for clarity of insight, pink for empathy and compassion, red for renewed life and vigor.
This entry is linked to our page "The Language of Gemstones and Minerals"