Lab 3 - will scratch glass. Cannot be scratched with a...

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Rocks – Minerals – inorganic, naturally occurring substances that have a characteristic chemical composition, distinctive physical properties, and crystalline structure. Clarity – transparent or translucent or opaque. Crystal Forms – displays of crystals, like cubes, pyramids, or prisms. The characteristic crystal form of a mineral is that minerals habit. Luster – a description of how light reflects from the surface of an object, such as a mineral. Metallic Luster (M) – reflect light just like the metal objects in your home. Nonmetallic Luster (NM) – a luster unlike that of the metal objects in your home. Streak – the color of a substance after it has been ground o a fine powder. Hardness – a measure of resistance to scratching. Hard Minerals –
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Unformatted text preview: will scratch glass. Cannot be scratched with a knife blade or masonry nail. Soft Minerals will not scratch glass. Can be scratched with a knife blade or masonry nail. Cleavage the tendency of some minerals to break along flat, parallel surfaces like the flat surfaces on broken pieces of galena. Fracture any break in a mineral that does not occur along a cleavage plane. Tenacity the manner in which a substance resists breakage. Reaction To Acid test minerals with acid to see if it fizzes. Striations straight hairline grooves on the cleavage surfaces of some minerals. Magnetism influence minerals, tested with magnet. Specific Gravity (SG) the ratio of the density of a substance divided by the density of water....
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This note was uploaded on 04/14/2011 for the course GEOL 101 taught by Professor Olinsky during the Spring '08 term at Texas A&M.

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