pat+minko+Rocks+and+minerals

== =For other uses, see Mineral (disambiguation).= == == =//** An assortment of minerals. **//= =//** A mineral is a naturally occurring solid chemical substance formed through biogeochemical processes, having characteristic chemical composition, highly ordered atomic structure, and specific physical properties. By comparison, a rock is an aggregate of minerals and/or mineraloids and does not have a specific chemical composition. Minerals range in composition from pure elements and simple salts to very complex silicates with thousands of known forms. The study of minerals is called **//= =//** Mineralogy is the study of crystal structure chemistr,crystakl struture, and physical (including optical) properties of minerals. Specific studies within mineralogy include the processes of mineral origin and formation, classification of minerals, their geographical distribution, as well as their utilization **//= media type="youtube" key="VnM8ebB06MU" width="425" height="350"