Aragonite | mineral | Britannica
Aragonite, widespread mineral, the stable form of calcium carbonate (CaCO 3) at high pressures.It may be distinguished from calcite, the commoner form of calcium carbonate, by its greater hardness and specific gravity.Aragonite is always found in deposits formed at low temperatures near the surface of the Earth, as in caves as stalactites, in the oxidized zone of ore minerals (with lead,Making A Rock In A Cup | Science project | Education,Sedimentary rocks are composed of pieces of rocks and minerals and even remains of animals and plants. All of these pieces are compressed and held together by other minerals.,Kids will love making sugar crystals in this sugar crystal science fair project which teaches important chemistry concepts like saturation and solubility. 5th grade,Dolomite: A sedimentary rock known as dolostone or,,Dolomite is found in sedimentary basins worldwide.,This dolostone is the host rock for the doubly-terminated quartz crystals known as "Herkimer Diamonds." It is vuggy, has a high silica content, and is much harder and tougher than the typical dolomite. The Herkimer Diamonds are found in petroleum-lined vugs in the rock unit.