ENVIRSC 1G03 Lecture Notes - Lecture 5: Orthoclase, Euhedral And Anhedral, Feldspar
12 Apr 2016
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Document Summary
The crust of the earth of composed of igneous rocks, sedimentary rocks, and metamorphic rocks. All these rock types are aggregates of one or more types of minerals. Rock (granite) constituent minerals: biotite, orthoclase feldspar, plagioclase feldspar, quartz. Minerals are naturally occurring, solid crystalline substances, inorganic, with definite chemical compositions and orderly internal atomic arrangements. Minerals are composed of chemical elements such as carbon, oxygen, silicon, magnesium etc. : in total, we know 92 naturally occurring elements" elements cannot be further subdivided by ordinary chemical and physical mean. Naturally occurring: to qualify as a mineral, the substance must be found in nature. Minerals are crystalline atoms that compose the mineral are arranged in an orderly, repeated, three dimensional array. Crystallize from magna, grow at depths in earth"s interior, precipitate from aqueous solution. What makes each mineral unique is the combination and arrangement of atoms in an internal structure. Mineral chemical composition can vary with undefined limits.
