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Igneous rocks

Igneous rocks. Geology of National Parks and Monuments Prof. Kurt Friehauf. Basalt. Mafic Fine-grained Black May have bubble holes like Swiss cheese Volcanic. Obsidian. Volcanic glass Smooth with sharp edges Forms by quick cooling Can be mafic or felsic Volcanic. Pumice.

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Igneous rocks

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  1. Igneous rocks Geology of National Parks and Monuments Prof. Kurt Friehauf

  2. Basalt • Mafic • Fine-grained • Black • May have bubble holes like Swiss cheese • Volcanic

  3. Obsidian • Volcanic glass • Smooth with sharp edges • Forms by quick cooling • Can be mafic or felsic • Volcanic

  4. Pumice • Froth of volcanic glass • Light weightcommonly floatsin water • Rough surface • Forms as foam when lava slops around • Volcanic

  5. Scoria • Mafic • Red color due to oxidation of iron in mafic lava • Rough, commonly bubbly • Volcanic

  6. Rhyolite • Felsic • Fine-grained • Pink/tan/white color • May contain pumice fragments • Volcanic

  7. Andesite Tuff • Intermediate • Fine-grained with chunks of other rocks • Green/gray • Forms by explosive eruption • Volcanic

  8. Granite • Felsic • Coarse-grainedcan see crystals • Pink/tan/white with dark specks • Plutonic (forms deep within earth, not volcanic)

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