Coarse Texture of
Granite (Photo © Duncan Heron)If you wish to use any of these photos, contact duncan.heron@duke.edu.
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Coarse Texture of
Granite (Photo © Duncan Heron)
Thin Section of
Granite(Photo © Duncan Heron)
Fine Texture of
Rhyolite (Photo © Duncan Heron)
Thin Section of
Rhyolite (Photo © Duncan Heron)
Basalt Thin
Section (Photo © Duncan Heron)
Glassy Texture of
Obsidian (Photo © Duncan Heron)
Porphyritic
Texture (Photo © Duncan Heron)
Basalt (Photo 
Thin Section of
Basalt Porphyry (Photo