 The mineral is a naturally occurring chemical compound, usually of crystalline form and not produced by life processes. The mineral has one specific chemical composition, whereas a rock can be an aggregate of different minerals or mineraloids. The study of minerals is called mineralogy. As of March 2018, there are more than 5,500 known mineral species, 5,312 of these have been approved by the International Mineralogical Association IMA. Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species, which were determined by the mineral's geological environment when formed. Changes in the temperature, pressure, or bulk composition of a rock mass cause changes in its minerals. Within a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a mineral variety, for example haemophist, the purple variety of the mineral species quartz. Minerals can be described by their various physical properties, which are related to their chemical structure and composition. Common distinguishing characteristics include crystal structure and habit, hardness, cluster, diaphenate, color, streak, tin acidity, cleavage, fracture, parting, specific gravity, magnetism, taste or smell, radioactivity, and reaction to acid. Minerals are classified by key chemical constituents. The two dominant systems are the Dana classification and the Strunz classification. Oxygen and oxygen constitute approximately 75% of the Earth's crust, which translates directly into the predominance of silicate minerals. The silicate minerals compose over 90% of the Earth's crust.5. The silicate class of minerals is subdivided into six subclasses by the degree of polymerization in the chemical structure. While silicate minerals have a base unit of azole for four, silicate tetrahedron that is, a silicon-cat ion coordinated by for oxygen anions, which gives the shape of a tetrahedron. These tetrahedra can be polymerized to give the subclasses, for though silicates no polymerization, thus single tetrahedra does silicates to tetrahedra bonded together Cyclosylacates rings of tetrahedra Inicilicates chains of tetrahedra Philosylacates sheets of tetrahedra and Tectosilicates three-dimensional network of tetrahedra. Other important mineral groups include the native elements, sulfides, oxides, halides, carbonates, sulfates, and phosphates.