EARTH MATERIALSEQ:What are igneous rocks?

An igneous rock is a naturally occurring solid that forms from a hot liquid

mineral assemblage that cools and freezes.

Igneous Rock Primer

CLASSROOMUNSQUARED

Igneous Rock Classification (Identification Key)

COMPOSITION

TEXTURE

Felsic(light color)

Intermediate

Mafic(dark color)

Ultramafic

Large Crystals(Intrusive or Plutonic) Granite Diorite Gabbro

Peridotite

Fine/no Crystals(Extrusive or Volcanic) Rhyolite Andesite Basalt

Large and Fine Crystals Porphyry

Vesicular(Extrusive) Pumice Scoria

Glassy(Extrusive) Obsidian

Fragmented(Extrusive) Tuff

QuartzOrthoclaseNa-plagioclaseMuscovite

Na-Ca plag.Amphibole

Ca-plag.Pyroxene

PyroxeneOlivine

Name and classify these rocks!

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Answers to ID Test1. Felsic intrusive - granite2. Felsic extrusive - rhyolite3. Mafic extrusive - basalt4. Mafic intrusive - gabbro5. Mafic vesicular - scoria6. Mafic glassy - obsidian7. Intermediate intrusive - diorite8. Intermediate extrusive – andesite9. Intermediate fragmented - tuff10. Intermediate int./ext. – porphyry

Separation of Minerals in a Partial Melt

Igneous Rock Bodies

Mafic Composition

Felsic Composition

What are these volcanic features?

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