Clue 1 - Igneous rocks - Station 4     Textures of igneous rocks
Wednesday, May 09, 2012
8:38 AM
Station 1:  What is a rock
Would you recognize a rock if you saw one?
To learn more and share 
Textures of igneous rocks
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Definition of a rock
A rock is a collection of minerals or smaller rocks that are naturally attached to each other and form a solid.
Note - A rock may be composed of glass rather than mineral matter.
Skill:  How to distinguish rocks from other objects.
"Distinguish" means to tell them apart. 
Look at each specimen and decide whether it is a rock or not.  
If an object is NOT a rock, explain why not.
What is the texture of your rock?
What does the texture tell you about conditions where it formed?
Fine-grained 
Aphanitic
Coarse-grained 
No minerals
Glassy