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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