09 Atomic Structure GEOS 1004

09 Atomic Structure GEOS 1004 - GEOS 1004, SPOTILA Lecture...

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GEOS 1004, SPOTILA Lecture 4, 9/3/09 MINERALS ATOMIC STRUCTURE atomic structure: systematic arrangement of atoms in orderly, repeating, 3-d array, called a lattice. 1 angstrom = 10 -7 mm 1 grain of sand = may be 10 21 molecules * The crystal lattice is produced by the framework of atoms that is repeated from the center of the crystal towards the crystal faces. Crystals grow from the inside to the outside; a crystal face was the active growing surfaec where crystal growth happened to stop. - any crystal of a certain mineral has same form -angles between faces for a given minerals are always the same -there are many shapes Atomic structure controlled by; 1) type of bonds ionic = close packing (high density) covalent = extend outward 2) ionic radius (size of atom) -also affects composition (some atoms don’t fit ) Mineral properties depend on both composition and structure; examples? What if we have things that have the same chemical composition? Pyrite vs. Galena CRYSTALLIZATION The formation of a mineral (i.e. growth) is called crystallization.
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This note was uploaded on 09/09/2011 for the course GEOG 1004 taught by Professor Staff during the Fall '07 term at Virginia Tech.

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09 Atomic Structure GEOS 1004 - GEOS 1004, SPOTILA Lecture...

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