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PPT4_mineralsnotes text version

PPT4_mineralsnotes text version - M INERALS Naturally...

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MINERALS • Naturally occurring• Inorganic• Homogeneous• Solid• Definite chemical composition• Ordered internal structure Mga nagpapanggap na minerals (MINERALOID) naturally occurring, inorganic material that is amorphous Ex. glass, opal POLYMORPHISM ability of a specific chemical substance to crystallize in more than one configuration, which is dependent upon changes in temperature, pressure, or both Marcasite FeS 2 FeS 2 Pyrite http://z.about.com/d/geology/1/0/4/F/graphite.jpg http://www.bradleygoughdiamonds.com/pictures/diamond.jpg Carbon Carbon Graphite Diamond PHYSICAL PROPERTIES OF MINERALS Color - caused by the absorption, or lack of absorption, of various wavelengths of light malachite fluorite Streak - the color of a mineral in powdered form - not always identical to the color - the color of a mineral in powdered form - not always identical to the color Hardness – resistance of mineral to abrasion or scratching Mohs ’ Scale of Hardness 1. Talc 2. Gypsum 3. Calcite 4. Fluorite 5. Apatite 6. Orthoclase 7. Quartz 8. Topaz 9. Corundum 10. Diamond HARDNESS MATERIAL 2.5 Fingernail 3.5 Copper coin 5 Steel nail 5 - 6 Glass 7 Streak plate
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