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natural history page title
Identifying rocks, minerals and fossils

Introduction
What is a rock?
What is a 
    mineral?

What is a fossil?
Rock, mineral or 
    fossil?

Rock key
    Sedimentary
   
    Igneous
        Fine grained 
            key

       
Pumice
       
Obsidian
       
Basalt
       
Unknown 
            fine 
            grained

       
Coarse 
            grained key

       
Granite
        Unknown 
           coarse 
           grained


   
Metamorphic
   
Unknown
Mineral key
Fossil key
Helpful books

  
Unknown coarse grained rock

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image of granodiorite igneous rock

Your specimen is a bit of a puzzle! The rocks in this key are common ones and it may be that you have an unusual rock or one that is difficult to identify. You could try the sedimentary and metamorphic rock keys, or could search the Virtual Store to see if your specimen matches any of the rocks featured there.
If you are still unable to identify your specimen, why not take it to a local museum or do some research in your local library?