White Calcite Cluster - Size #1 White Calcite is a common calcium mineral that crystallizes in the form of masses and cubic formations. It can be found as pearly/chalky white, as well as pale white to light grey. Calcite clusters such as these have another name called “flowers of iron” which is fitting for these beautiful clusters. These specimens makes for a wonderful display piece and extra care should be taken when handling it as it is delicate. White calcite cluster specimens sought by collectors for their remarkable variety of crystal habits and colors, unusual size, affordability, and crystal form. Mineralogists recognized aragonite as a mineral species in 1790, a time when it served as a white paint pigment.