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

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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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