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Transcript 
The Scheme for
Igneous Rock Identification
A Brief Tour
Grain Size
Crystal size
Description
Igneous rocks have
“Intergrown Crystals”
Intergrown
Intergrown
Intergrown
Not Intergrown
Outside
theEarth:
volcano:
Extrusive
Inside the
Intrusive
Where it was formed
Bubbles?
Yes= Vesicular
Bubbles?
No=Non-vesicular
Very Light
Color
Neither Light nor Dark
NotVery Light Not Very DarkVery Dark
Darkest
Lightest
Very Light
Density
Medium Density
Very Dense
Finding The Minerals
Identify the rock.
Unless you have other information,
work in the middle of the rock’s box.
This is the amount of Potassium Feldspar in the rock.
This is the amount of Quartz in the rock.
This is the amount of Plagioclase Feldspar in the rock.
Use tick marks on a scrap paper to measure the percentage.
Potassium Feldspar 25%
Quartz 40%
Practice
Name a light-colored, fine-grained
rock with no bubbles.
Name a coarse-grained, dense rock.
Name a very light-colored, glassy,
extrusive rock with bubbles.
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