mineral formation 11/20/15 3-3 pgs. 68-71 in: why are minerals important? put your lab on the books
TRANSCRIPT
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Mineral Formation 11/20/153-3 pgs. 68-71
•IN: Why are minerals important?
Put your Lab on the books
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How do Minerals form?• Almost all minerals can be found in the Earth’s
crust• Some minerals formed when a giant star exploded• Some minerals form here on the Earth• They form in many different environments under
different physical and chemical conditions– Temperature, pressure, chemicals, water
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Why are Minerals Important?
• Rocks are made of minerals.
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Example,
• Granite– A rock composed of feldspar, mica, and quartz.
FeldsparMica Quartz
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Mineral Classification
• Minerals are classified by their chemical composition.–What they are made of–Where they formed
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Two Types of Minerals
• Silicates–Contain oxygen and silicon–Make up 90% of the Earth’s crust
• Nonsilcates–Do not contain oxygen and silicon–Make up less than 10% of the Earth’s crust
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Properties of MineralsProperties of Minerals• Color• Luster• Streak• Cleavage and Fracture•Hardness•Density• Special Properties
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What is mined?Ore – a mineral deposit large
enough and pure enough to be mined for profit.
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MiningMining•Mineral ores are nonrenewable
resources.
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MiningSurface mining – the removal of
minerals or other materials at or near the Earth’s surface.
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MiningDeep mining – the removal of
minerals or other materials from deep within the Earth.
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Responsible Mining• Reclamation – the process of
returning land to its original state after mining is completed.
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Mica• Shiny and soft• Separate easily into sheets
Unique Minerals
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Unique Minerals
Halite• Tastes salty
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Unique Minerals
Magnetite• Magnetic
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•OUT: What are some ways we could reduce our need for mining?