Earth Sciences Rock ID: (Igneous Rocks)

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11 Terms

1
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Obsidian

Texture: Glassy

Color: Black

Formation: Extremely Fast cooling of Silica Rich Lava

Location: Convergent zone at the surface of the continental crust

<p>Texture: Glassy</p><p>Color: Black</p><p>Formation: Extremely Fast cooling of Silica Rich Lava</p><p>Location: Convergent zone at the surface of the continental crust</p>
2
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Pumice

Texture: Vesicular

Color: White/grey

Formation: Extremely Fast cooling of Felsic Rich with Gas

Location: Convergent zone at the surface of the continental crust

<p>Texture: Vesicular</p><p>Color: White/grey</p><p>Formation: Extremely Fast cooling of Felsic Rich with Gas</p><p>Location: Convergent zone at the surface of the continental crust</p>
3
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Ash tuff

Texture: Pyroclastic

Fragments: Less than 2mm

Formation: Welding of pyroclastic degree

Location: Convergent zone at the surface of the continental crust

Powdery sensation

<p>Texture: Pyroclastic</p><p>Fragments: Less than 2mm</p><p>Formation: Welding of pyroclastic degree</p><p>Location: Convergent zone at the surface of the continental crust</p><p>Powdery sensation</p>
4
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Lapilili Tuff

Texture: Pyroclastic

Color: White

Fragments: Larger than 2mm

Formation: Welding of pyroclastic degree

Location: Convergent zone at the surface of the continental crust

<p>Texture: Pyroclastic</p><p>Color: White</p><p>Fragments: Larger than 2mm</p><p>Formation: Welding of pyroclastic degree</p><p>Location: Convergent zone at the surface of the continental crust</p>
5
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Rhyolite

Texture: Aphantic

Color: Pink/Purple/Reddish

Composition: Felsic

Formation: Fast cooling of lava, extrusive

Location: Convergent zone at the surface of the continental crust

<p>Texture: Aphantic</p><p>Color: Pink/Purple/Reddish</p><p>Composition: Felsic</p><p>Formation: Fast cooling of lava, extrusive</p><p>Location: Convergent zone at the surface of the continental crust</p>
6
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Andesite

Texture: Porphyritic/Aphantic

Color: Light Grey

Composition: Intermediate

Formation: First slow and then fast or fast

Location: Convergent zone at the surface of the continental crust

<p>Texture: Porphyritic/Aphantic</p><p>Color: Light Grey</p><p>Composition: Intermediate</p><p>Formation: First slow and then fast or fast</p><p>Location: Convergent zone at the surface of the continental crust</p>
7
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Basalt

Texture: Vesicular/Aphantic

Color: Black (red with oxidation)

Composition: Mafic

Formation: Fast cooling of magma with gas, extrusive

Location: Divergent boundary at the surface of the oceanic crust

<p>Texture: Vesicular/Aphantic</p><p>Color: Black (red with oxidation)</p><p>Composition: Mafic</p><p>Formation: Fast cooling of magma with gas, extrusive</p><p>Location: Divergent boundary at the surface of the oceanic crust</p>
8
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Granite

Texture: Phaneritic

Color: Pinkish

Minerals: orthoclase, albite, quartz, biotite,muscovite, hornblende

Composition: Felsic

Formation: Slow cooling of magma, intrusive

Location: Convergent boundary beneath the continental crust

<p>Texture: Phaneritic</p><p>Color: Pinkish</p><p>Minerals: orthoclase, albite, quartz, biotite,muscovite, hornblende</p><p>Composition: Felsic</p><p>Formation: Slow cooling of magma, intrusive</p><p>Location: Convergent boundary beneath the continental crust</p>
9
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Diorite

Texture: Phaneritic

Color: Grey (70/30 black and white)

Minerals: albite, labradorite, quartz, biotite,muscovite, hornblende, augite

Composition: intermediate

Formation: Slow cooling of magma, intrusive

Location: Convergent boundary beneath the continental crust

<p>Texture: Phaneritic</p><p>Color: Grey (70/30 black and white)</p><p>Minerals: albite, labradorite, quartz, biotite,muscovite, hornblende, augite</p><p>Composition: intermediate</p><p>Formation: Slow cooling of magma, intrusive</p><p>Location: Convergent boundary beneath the continental crust</p>
10
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Granodiorite

Texture: Phaneritic

Color: Grey (50/50 white and black)

Minerals: albite, labradorite, biotite,muscovite, hornblende, augite

Composition: Intermediate

Formation: Slow cooling of magma, intrusive

Location: Convergent boundary beneath the continental crust

<p>Texture: Phaneritic</p><p>Color: Grey (50/50 white and black)</p><p>Minerals: albite, labradorite, biotite,muscovite, hornblende, augite</p><p>Composition: Intermediate</p><p>Formation: Slow cooling of magma, intrusive</p><p>Location: Convergent boundary beneath the continental crust</p>
11
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Gabbro

Texture: Phaneritic

Color: Dark grey/black

Minerals: anorthite, hornblende, augite, olivine

Composition: Mafic

Formation: Slow cooling of magma

Location: Divergent boundary beneath the oceanic crust

<p>Texture: Phaneritic</p><p>Color: Dark grey/black</p><p>Minerals: anorthite, hornblende, augite, olivine</p><p>Composition: Mafic</p><p>Formation: Slow cooling of magma</p><p>Location: Divergent boundary beneath the oceanic crust</p>

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