minerals - Geology: Study of Rocks Whats a rock? A...

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Unformatted text preview: Geology: Study of Rocks Whats a rock? A naturally occurring consolidated mixture of minerals or mineral- like substances In short, Rocks are composed of Minerals! Whats a Mineral? A naturally occurring inorganic solid with a regular internal atomic structure and a specific chemical composition. MUST obey certain conditions! Jay Schomer 1. Naturally occurring Augite Naturally occurring From the womb of nature not formed in the laboratory 1. Naturally occurring 2. Crystalline substance Crystalline substance-an internal structural framework of atoms (or ions) arranged in a regular geometric pattern. Quick Definition: Crystal Single, continuous, uninterrupted, piece of a crystalline solid bounded by flat surfaces These flat surfaces are Crystal faces Grow naturally when mineral formed Crystals form in a variety of geometries in shapes, some mundane, others spectacular Controlled by crystal structure- internal framework ( more coming up in 8 slides! ) Quartz Crystal face Crystal Structure: Soldiers in Formation Crystallography The study of crystals, including growth, structure and classification by form Symmetry Reflection Across a Plane mirror plane Crystallography Symmetry Symmetry Axis of Rotation 1-fold, 2-fold,axis Symmetry, point-groups & space groups Crystallography is based upon the idea of translational, rotational & inversion or mirror, symmetry. Its all about finding symmetrical relationships across different axes Isometric (cubic) Tetragonal Orthorhombic Hexagonal Trigonal Monoclinic Is Glass a mineral? Glass not a mineral as it is amorphous Sea Glass from France Stjohnbeachguide.com Amorphous Without shape Or structure vs. Same composition as quartz (SiO2), but diff. arrangement External form controlled by internal framework of elements Minerals have an interior code Based on their chemical composition That influences interior structure, And external form DNA Ex. Hexagonal Quartz 1. Naturally occurring 2. Crystalline substance 3. Solid Must be a single solid phase that maintains its shape indefinitely and does not conform to shape of container....
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This note was uploaded on 04/03/2012 for the course GEOL 100 taught by Professor Neitzke during the Fall '10 term at Rutgers.

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minerals - Geology: Study of Rocks Whats a rock? A...

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