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Rocks and Minerals - PowerPoint PPT Presentation


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Rocks and Minerals. Minerals. A naturally occuring, inorganic, solid with a definate composition and an orderly arrangement of atoms. Crystals.

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Presentation Transcript
minerals
Minerals
  • A naturally occuring, inorganic, solid with a definate composition and an orderly arrangement of atoms.
crystals
Crystals
  • A mineral will form crystals when the atoms arrange in a pattern. The larger the crystal the longer it took to develop. Minerals formed when magma cools slowly will form large crystals. When lava cool rapidly it will form very small crystals. They may be to small to see with the naked eye. Crystals can also form from dissolved liquids.
mineral identification
Mineral identification
  • 1. Hardness
  • 2. Luster
  • 3. Color
  • 4. Streak
  • 5. Cleavage and fracture
hardness

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Scratched by finger nail

Scratched by steel knife

Will scratch glass - gemstones

Talc

Gypsum

Calcite

Fluorite

Apatite

Moonstone

Quartz

Topaz

Corundum

Diamond

Hardness
  • The measure of how easily a mineral can be scratched.
luster
Luster
  • Describes how light reflects from a minerals surface. Luster is defined as either metallic or nonmetallic.