Igneous Rocks
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Igneous Rocks

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    Igneous Rocks Igneous Rocks Presentation Transcript

    • 1. Minerals A. can be liquids B. are organic C. are inorganic D. have no crystal structure 2. is a measure of how easily a mineral is scratched. A. luster B. cleavage C. hardness D. fracture 3. The color of a minerals powder on an unglazed porcelain tile is . A. luster B. hardness C. density D. streak 4. When halite breaks it displays . A. fracture B. cleavage C. luster D. crystal form 5. Halite forms crystals. A. triclinic B. monoclinic C. hexagonal D. cubic
    • ReviewReview Minerals Identifying minerals
    • Igneous RocksIgneous Rocks Rocks formed from melted minerals
    • Igneous RocksIgneous Rocks Some have crystals Slow cooling = “large” crystals –Granite
    • Granite
    • Igneous RocksIgneous Rocks Fast cooling = “small” crystals - Basalt
    • Basalt
    • Granite Basalt
    • Igneous RocksIgneous Rocks Extra fast cooling = no crystals
    • Obsidian: Volcanic, “Glassy”
    • Pumice: Volcanic, “Frothy”Pumice: Volcanic, “Frothy”
    • Krakatoa Island 1883
    • Pumice: Volcanic, “Frothy”
    • Mt. St. Helens 1980