Crystal Cozart ESC1000 September 15, 2009 Ch.2 Homework 1.) A mineral is a naturally occurring inorganic solid with a definite chemical composition and a crystalline structure. Chemical composition and crystalline structure are the two most important properties of a mineral that distinguishes them from all others. 2.) Both coal and oil form by the decay of plants and animals and are not minerals because of their organic properties. In addition, oil is not a mineral because it is not a solid and has neither a crystalline structure nor a definite chemical composition. 10.) Geologists commonly use properties such a crystal habit, cleavage, hardness, color, luster, fracture, specific gravity, and streak to identify minerals. Crystal habit is the characteristic shape of a mineral and the manner in which aggregates of grow. Cleavage is the tendency of some minerals to break along flat surfaces. Hardness is the resistance of a mineral to scratching and is one of the most commonly used properties for identifying a mineral. Color
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