Igneous Rocks

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Unit 1

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13 Terms

1
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Mafic

dark color, dense, lower amounts of SiO2 (silica), higher in magnesium + iron

2
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Felsic

lighter color, not very dense, high amounts of SiO2 (silica), lacks iron + magnesium

3
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Extrusive

volcanic, cools quickly at surface, think “extruded”

Aphanitic (smaller grains)

glassy/vesicular textures

4
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Intrusive

plutonic, cools slowly underneath surface, think “intruder”

Phaneritic (bigger grains)

5
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Granite

felsic + phaneritic

<p>felsic + phaneritic </p>
6
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Diorite

intermediate + phaneritic

<p>intermediate + phaneritic </p>
7
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Gabbro

mafic + phaneritic

<p>mafic + phaneritic </p>
8
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Pumice

felsic + vesicular + aphanitic

<p>felsic + vesicular + aphanitic</p>
9
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Scoria

mafic + vesicular + aphanitic

<p>mafic + vesicular + aphanitic </p>
10
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Obsidian

can be any comp., glassy

<p>can be any comp., glassy</p>
11
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Rhyolite

felsic + aphanitic

<p>felsic + aphanitic</p>
12
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Andesite

intermediate + aphanitic

<p>intermediate + aphanitic</p>
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Basalt

mafic + aphanitic

<p>mafic + aphanitic </p>