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Published byAgnes Preston Modified over 9 years ago
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Earth Science
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The ability of a mineral to glow DURING and after exposure to ultraviolet light
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The bending of light rays as they pass through a mineral
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The ability of a mineral to continue to glow AFTER exposure to ultraviolet light
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Atoms are bonded tightly together
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The mineral will split into even sheets
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Quartz Feldspar Mica Calcite Iron
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halite
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Gold and copper
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90%
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Silicate minerals Nonsilicate minerals
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Carbonates Oxides Sulfides Sulfates Halides Native elements
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Silicon Oxygen
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Feldspar is an example Composed to interconnected tetrahedrons that form an intricate framework
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Chemical composition
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Pitchblende
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feldspar
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magnetite
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Density
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Silicon Oxygen
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Sodium Calcium
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brilliant
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lodestone
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Garnet
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The mineral with the higher number can scratch the lower number
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Quartz is a framework silicate It contains only silicon-oxygen tetrahedra The bonds between the tetrahedra are very strong This makes quartz extremely hard
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Feldspar is a framework silicate Some tetrahedra in feldspar have atoms of metal instead of silicon The bonds between these atoms are weaker than those between silicon and oxygen Therefore, feldspar is not as hard as quartz
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