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1st test cheatsheet

1st test cheatsheet - Mineral/Rock Graphite ML Galena ML...

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Mineral - any naturally occurring, inorganic, solid element or compound that has a regular internal structure and a fairly constant chemical composition. Luster - appearance of a mineral in reflected light Hardness - resistance of a mineral to scratching Streak - color of the ground-up or powdered mineral Cleavage and fracture - the way the mineral breaks Striations - straight parallel grooves seen in reflected light on some cleavage surfaces of plagioclase feldspar. Thread-like - markings visible on some cleavage surfaces of potassium feldspar Mineral Identification Procedure 1) Determine luster- metallic or non 2) Determine hardness range by scratching 3) Determine cleavage (none, 1,2,3,4,6, & angles) 4) Determine color of the streak 5) Test for acid reaction, if harder than 4 on Mohs’ scale, don’t bother. 6) Check for other special properties (striation, taste, magnetism, thread-like, elasticity…) Fingernail – hardness 2.2 New Penny – hardness 3.2 Nail – hardness 5 Glass – hardness 5.5 Streak Plate – hardness 7 Sedimentary - rocks composed of materials derived by weathering of existing rocks.
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