Coarse Texture of
Granite (Photo © Duncan Heron)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)
Basalt (Photo 
Porphyritic
Texture (Photo 
Thin Section of
Basalt Porphyry (Photo