2-Minerals Part 1 - What is a mineral? Crystals faces and...

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Unformatted text preview: What is a mineral? Crystals faces and angles X-ray diffraction unit cell Why is a mineral? minerals vs. glass polymorphs Atomic matters chemical bonds charge balance, size Composition of the Earths crust Silica tetrahedra Chapter 3: Minerals Next lecture: Finish chapter 3, Start chapter 5 We all think of the Earth as being made of rocks, but rocks are aggregates of minerals. Minerals are the true building blocks of the planet. If you look at rocks closely enough, you will see the minerals within. The (Traditional) Definition of a Mineral: Solid Naturally occurring Fixed composition, or one that varies within limits Has an ordered, repeating atomic structure: crystalline Inorganic Is this a Mineral? snowflake glass salt YES halite YES NO! NO! YES pearls NO! snottites Inorganic?? http://www.geo.utexas.edu/chemhydro/LowerKane/microhabitats.htm Minerals have always been considered to be inorganic, and certainly most of them are. However, in recent years researchers at UT and elsewhere have discovered that micro-organisms can play a crucial role in forming minerals in some environments, such as the caves shown here. They might be important throughout the near- surface environment, including soils and sedimentary deposits, and even several kilometers down. As a result, we are having to revise some of our ideas about minerals and how they form. What is a mineral?...
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This note was uploaded on 03/21/2012 for the course GEO geo taught by Professor Long during the Fall '10 term at University of Texas at Austin.

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2-Minerals Part 1 - What is a mineral? Crystals faces and...

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