To determine felsic, intermediate, and mafic coloring...
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Comparing it to a penny
Obsidian:
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"Felsic", aphanitic/glassy, solid black
,(Peridotite) Olivine:
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"Ultramafic", phaneritic, usually isolated from being green
Intermediate rock:
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50 - 70 % SiO2 composition
Glassy rocks form due to the strange...
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Compositions or if the rock cooled too quickly
Phaneritic are large crystals which have...
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, Had time to grow large most commonly underground
Andesite:
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Intermediate, porphyritic, spider eyes
Quartz:
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felsic, pegmatic/glassy/aphanitic, its quartz not mistaken
with calcite which is less transculcent
Felsic eruptions are highly explosive and can produce...
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Give this one a try later!
Comparing it to a penny
Obsidian:
Give this one a try later!
"Felsic", aphanitic/glassy, solid black
,(Peridotite) Olivine:
Give this one a try later!
"Ultramafic", phaneritic, usually isolated from being green
Intermediate rock:
Give this one a try later!
50 - 70 % SiO2 composition
Glassy rocks form due to the strange...
Give this one a try later!
Compositions or if the rock cooled too quickly
Phaneritic are large crystals which have...
Give this one a try later!
, Had time to grow large most commonly underground
Andesite:
Give this one a try later!
Intermediate, porphyritic, spider eyes
Quartz:
Give this one a try later!
felsic, pegmatic/glassy/aphanitic, its quartz not mistaken
with calcite which is less transculcent
Felsic eruptions are highly explosive and can produce...
Give this one a try later!
