Rose quartz is also a very attractive ornamental stone and is popular in spherical form. Much rose quartz was extracted from a famous site near Custer, South Dakota, but now, most of the world's supply of good carvable rose quartz comes from Brazil. The 50mm Rose Quartz Sphere is two inches in diameter. Calcite can form rocks of considerable mass and constitutes a significant part of all three major rock classification types. It forms oolitic, fossiliferous and massive limestones in sedimentary environments and even serves as the cements for many sandstones and shales.
Limestone becomes marble from the heat and pressure of metamorphic events.
Calcite is even a major component in the igneous rock called carbonatite and forms the major portion of many hydrothermal veins. This is even the primary ingredient in many antacid tablets. The 50mm Orange Calcite Sphere is two inches in diameter. Animated image Continue Yellow Calcite Sphere - Yellow Calcite sphere of depth and optical beauty. The crystals of calcite can form literally a thousand different shapes by combining the basic forms of the positive rhombohedron, negative rhombohedron, steeply, moderately and slightly inclined rhombohedrons, various scalahedrons, prism and pinacoid to name a few of the more common forms.