Igneous Rocks Key Definitions

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Igneous Rocks
Cooled from magma
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Magma
Molten rock
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Lava
Molten rocks that cools at the surface
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Silicic Igneous Rocks
Have a composition rich in silica - of more than 66% and are light coloured (leurocratic)
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Intermediate Igneous Rocks
Silica content of 66-52% and are grey (mesocratic)
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Magic Igneous Rocks
Silica content of 52-45% and are dark (melanocratic)
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Ultramafic Igneous Rocks
Silica content less than 45%
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Felsic Minerals
Light coloured and silica rich
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Cooling
Igneous rocks may be at the surface or at depth
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Extrusive
The general term for all igneous rocks that cool at the surface
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Hypabyssal
When he igneous rocks form at relatively shallow depth below the surface
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Plutonic
When igneous rocks form deep below the surface.
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Other cards in this set

Card 2

Front

Molten rock

Back

Magma

Card 3

Front

Molten rocks that cools at the surface

Back

Preview of the back of card 3

Card 4

Front

Have a composition rich in silica - of more than 66% and are light coloured (leurocratic)

Back

Preview of the back of card 4

Card 5

Front

Silica content of 66-52% and are grey (mesocratic)

Back

Preview of the back of card 5
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