Igneous rocks and characteristics

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Geology

igneous rocks

Last updated 9:25 PM on 2/12/23
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23 Terms

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Fine crystals
Short cooling period
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Coarse crystals
Long cooling period
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Anhedral crystals
Short cooling period, poorly formed crystal faces
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Subhedral crystals
Medium cooling period, imperfect crystal faces
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Euhedral crystals
Long cooling period, well formed crystal faces
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Equicrystalline
Crystals are the same size
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Porphyritic
Crystals are different sizes due to 2 stage cooling
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Mean equation
Xbar \= Sum of X / n
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Median equation
(n+1)/2
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Mode
The value that occurs most frequently
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Silicic rocks
Light in colour
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Intermediate rocks
Grey in colour
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Basic and mafic rocks
Dark in colour
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Ultra basic rocks
Black in colour
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Fine grained silicic
Rhyolite
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Medium grained silicic
Micro granite
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Coarse grained silicic
Granite
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Fine grained intermediate
Andesite
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Fine grained mafic
Basalt
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Medium grained mafic
Dolerite
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Coarse grained mafic
Gabbro
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Coarse grained ultramafic
Peridotite
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Glassy silicic
Obsidian