Igneous Rocks

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8 Terms

1
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Intrusive/Plutonic

Formed under/subsurface and slowly = large crystals, coarse grained, shiny

2
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Extrusive/Vesicular

Formed above surface, quickly = small crystals fine grained,

3
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Felsic

High in silicates, low in metal = lighter

4
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Mafic

High in metal, low in silica = dark

5
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Aphanitic

another word for extrusive/intrusive/fine grained

6
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Porphyritic

another world for plutonic/vesicular/coarse grained

7
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Glassy

no organization like obsidian

8
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Pyroclastic material

ash