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ESCI112 > Lab 3: Igneous rocks > Flashcards

Lab 3: Igneous rocks Flashcards

1
Q

Texture

A

used to describe the shape, size and arrangement of minerals within a rock

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2
Q

Crystalline granular, coarse grained

A

Dunite, gabbro, diorite, grano-diorite

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3
Q

Crystalline granular, fine grained

A

Dolerite

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4
Q

Porphyritic

A

Trachyte,andesite, basalt, pyroxenite, dacite, rhyolite

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5
Q

Glassy

A

Obsidian

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6
Q

Pyroclastic/fragmental

A

Ignimbrite, tephra

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7
Q

Vesicular

A

Pumice, olivine basalt, scoria, rhyolite

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8
Q

Porphyritic definition

A

combination of phenocrysts and groundmass

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9
Q

Glassy definition

A

Magma has cooled instantly on eruption

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10
Q

Vesicular definition

A

Gas in the magma has been trapped in the rock, forming bubbles in the cooled rock

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11
Q

Pyroclastic definition

A

Rocks formed from exploded fragments of magma

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ESCI112 (10 decks)

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