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Unformatted text preview: LECTURE 3 MINERALS DEFINITION: naturally occurring inorganic homogeneous solid that has a definite chemical composition and an ordered internal structure Mineraloid • Naturally occurring inorganic material that is amorphous(solid with no long-range order of the positions of atoms) – ex. Obsidian, opal, glass, pearl, etc. Polymorphism • Ability of a specific chemical substance to crystallize in more than one configuration, which is dependent upon changes in temperature, pressure, or both (ex. Pyrite, marcasite, graphite, diamond) PHYSICAL PROPERTIES 1. Color – caused by the absorption or lack of absorption of various wavelengths of light 2. Streak – the color of the mineral in powdered form (not necessarily similar to the color in unpowdered form). 3. Hardness – the strength of the structure of the mineral relative to the strength of its...
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- Fall '10
- Silicate minerals, Greek word, Luster, rock forming minerals, Inosilicate