igneous classification

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13 Terms

1
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what is holocrystalline?

the magma has entirely crystallised

2
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what is holohyaline?

all glassy texture

3
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what is microcrystalline?

can only see crystals under a microscope

4
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what is cryptocrystalline?

crystals cannot be seen under a microscope but too grainy too eb glassy

5
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<p>what texture is this?</p>

what texture is this?

phaneritic texture

6
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what is porphytic texture?

large crystals in a very fine grained groundmass

<p>large crystals in a very fine grained groundmass</p>
7
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what are pyroclastic textures?

the producrs of explosive reactions usually tiny pieces of crushed volcanic rock which can turn into tephra

8
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what does the grain size reflect?

crystallisation conditions

9
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what grain size do volcanic rocks usually have?

finer grained

10
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why are volcanic rocks finer grained?

there is very little time to crystalluses as cools down to teperatures below when cyrstals form rapidly leading to glassy or finer grained rocks

11
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why are plutonic rocks usually holocrystalline?

slow cooling so have lots of time to crystallise

12
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what are felsic minerals?

light coloured minerals

13
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what are mafic minerals?

dark coloured minerals