Minerals. Natural Solid Inorganic Definite chemical composition Crystal structure due to internal arrangement of atoms. http://www.minerals.net/gemstone/index.htm. http://www.mii.org/www.mii.org. General Facts about Minerals. Between 2 - 3,000 have been identified
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Muscovite (white mica)
Biotite (black mica)
Magnetite, limonite, and other iron oxides
PyriteLess than a dozen are common in most rocks
crystal shape (form)
density (specific gravity)
special properties --reaction to acid --fluorescence --salty taste --magnetismMinerals are identified by their key characteristics
Carbonates react with dilute HCl and other acids by fizzing or bubbling (releasing CO2 gas)Special Characteristics--the “Acid Test”
“Cat-eye effect: closely packed parallel fibers within minerals reflect light
Effect of light reflection in which a six-sided star shape appears.
Saleeite from Australia