List of articles in "Chemical Substance" category - Page 1050

Calcium carbonate is a chemical compound with the formula CaCO3. It is a common substance found in rocks in all parts of the world and is the main component of […]

Lapis lazuli /ˈlæpɪs ləˈzuːliː/ or /ˈlæʒuːlaɪ/ (sometimes abbreviated to lapis) is a deep blue semi-precious stone that has been prized since antiquity for its intense color.Lapis lazuli was being mined […]

Lazurite is a tectosilicate mineral with sulfate sulfur and chloride with formula: (NaCa)8[(SClSO4OH)2(Al6Si6O24)]. It is a feldspathoid and a member of the sodalite group. Lazurite crystallizes in the isometric system […]

Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). The other polymorphs are the minerals aragonite and vaterite. Aragonite will change to calcite at 380–470°C […]

Carnelian (also spelled cornelian) is a brownish-red mineral which is commonly used as a semi-precious gemstone. Similar to carnelian is sard which is generally harder and darker (the difference is […]

Chalcedony /kælˈsɛdəni/ is a cryptocrystalline form of silica composed of very fine intergrowths of the minerals quartz and moganite. These are both silica minerals but they differ in that quartz […]

Silicon dioxide also known as silica (from the Latin silex) is a chemical compound that is a dioxide of silicon with the chemical formula SiO2. It has been known since […]

Fluorite (also called fluorspar) is the mineral form of calcium fluoride CaF2. It belongs to the halide minerals. It crystallizes in isometric cubic habit although octahedral and more complex isometric […]

A ruby is a pink to blood-red colored gemstone a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium. […]

Hornblende is a complex inosilicate series of minerals (ferrohornblende – magnesiohornblende). It is not a recognized mineral in its own right but the name is used as a general or […]