GEOL 104 Lect4

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Department
Geological Sciences and Geological Engineering
Course
GEOL 104
Professor
Michael T.Mc Bride
Semester
Winter

Description
Crystals Minerals are crystalline solidsUnder ideal conditions minerals can grow and form perfect crystalsw ith planar surfaces sharp corners and straight edges which is the external manifestation to an ordered internal atomic structureMinerals dont always show well formed crystal faces but always have internal crystalline structureCrystalline structure is very important for a mineral because it helps determine the properties of a mineralA good example of this is diamond and graphiteIn diamond each carbon is very strongly bonded to 4 other carbonsthis makes diamond the hardest substance on earth it has a hardness of 10diamond has 4 different cleavage directions direction in which it can breakLustre is the way it reflects light to your eyes and diamond has excellent lustreIn graphite each carbon is bonded to
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