WorksheetsIgneous Rock Lab
Total questions: 13
Worksheet time: 50mins
Let's start with the vesicular texture:Locate your 2 rocks with holes in them.
Pumice has holes and light coloring (felsic).
Pumice is rock number...
1
3
6
7
Now let's look at the other vesicular rock (holes).
Scoria is dark colored and has many holes from rapid cooling at the surface.
Scoria is rock number...
3
1
6
7
Which rock is obsidian? It is also known as volcanic glass.
1
3
8
9
Let's focus on intrusive (large crystals). There should be 3 rocks that have large crystals. What are the 3 with large crystals
1,2, 4
1,4,5
1,8,3
2, 3,8
The intrusive rock (from the last question) that is lightest in color (or contains light pink) is granite. Which rock number is granite?
1
2
4
5
The intrusive igneous rock (from question 4) that is half light and half dark (polka dots) is diorite. Which mineral is diorite?
1
2
4
5
Now you can pull out the 3 rocks you have left to identify. They should be.....
2, 3, 8
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The darkest of the extrusive is basalt. Which number is basalt?
2
3
8
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The remaining rock should be porphorytic (both small and big crystals). It should be the intermediate extrusive rock andesite. Which number is andesite?
2
3
8
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Which rock type is describes as glassy or fine grained
extrusive
intrusive
neither
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Which rock type is described as coarse grained?
extrusive
intrusive
neither
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Which of the following would form below the surface in a pluton?
Granite
basalt
obsidian
pumice
