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GLGY201 Lab > Igneous Textures > Flashcards

Igneous Textures Flashcards

1
Q

Intrusive

A

rocks that crystallize below the surface, slowly

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2
Q

Extrusive

A

rocks that form from cooling and crystallization above the surface, QUICKLY

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3
Q

Extrusive

A

rocks that form from cooling and crystallization above the surface, quickly

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4
Q

Crystalline

A

interlocking crystals

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5
Q

Phaneritic

A

associated with intrusive, BIG crystals b/c long time to grow due to slow cooling of magma

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6
Q

Aphanitic

A

associated with extrusive, tiny crystals due to rapid cooling near-surface = less time to grow

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7
Q

Glassy

A

No/few crystals = glassy/glossy due to lava cooling extremely rapidly

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8
Q

Porphyritic

A

Two different crystal sizes in the same rock, indicative of multi-stage cooling. Large crystals = phenocrysts

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9
Q

Vesicular

A

Cavities (vesicles) formed by trapping of gases released during crystallization of lava

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GLGY201 Lab (6 decks)

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