Yellow Calcite, with its opaque and translucent qualities, has a naturally lustrous pearly finish that is smooth to the touch. Often classified as a “collector's stone”--it is not actually rare! But it is a stone for collectors mainly because it lacks the hardness of many gemstones and is quite soft and fragile compared to other harder gem types. It is a very pretty and abundant stone that is a common constituent of sedimentary rock, such as limestone, which often contains organic materials including the shell remains of marine organisms. In fact, the composition of Calcite is similar to various organic gemstones such as pearls and coral. The name "Calcite" is derived from the German Calcite, a term coined in the 19th century from the Latin word for lime, calx (genitive calcis) with the suffix -ite used to name minerals. The colors of Calcite range from white to naturally occurring shades of gray, red, orange, yellow, green, blue violet, brown, and sometimes black. It may be transparent and crystalline, translucent or opaque—but in its purest form, Calcite crystals are completely colorless and transparent. Metaphysical essence: Yellow Calcite is associated with a clear mind, inner wisdom, comfort, and reassurance.