Geo Ch3 Notes - Geology Ch. 3 Notes Plane Faces Minerals-...

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Geology Ch. 3 Notes Plane Faces Minerals - naturally occurring, inorganic solid with a defined chemical composition and an ordered arrangement of atoms; crystalline form of matter; I. Crystals A. Bounded by flat planes, corresponding faces of different crystals of a mineral all intersect at the same angle, shape maybe be different, but any two sides of quartz have a 60° angle. i. Angles between crystals differ from angles of quartz—defining characteristic ii. French crystallographer R. Haügy proposed crystals are built from tiny building blocks but they’re not always the same shape as the entire crystal B. Probing Crystals with X-rays -- Max von Laue trained x-rays on crystals and proved x-rays are waves and crystals are internally ordered i. Symmetrical patterns on photographic paper reveals the atomic arrangement in crystals ii. Xrays are now used to identify minerals because x-ray analysis can match sample unknown with positively identified minerals C. Unit Cells — Haügy’s “building blocks,” smallest and simplest 3D piece of an ordered, repeating pattern in a crystal that is needed to convey the info of the atomic positions. Entire crystal is made of countless unit cells I I. Minerals A. The abundance of chemical elements play a key role in determining which mineral is most common—5
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This note was uploaded on 04/24/2008 for the course GEO 301 taught by Professor Long during the Fall '07 term at University of Texas at Austin.

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Geo Ch3 Notes - Geology Ch. 3 Notes Plane Faces Minerals-...

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