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1. Igneous Rock Identification
2. ESRT Page 6 Igneous Rock Scheme
3. Obsidian Non-Vesicular Glassy Texture
Felsic Composition
Usually Black may be Brown
Extrusive
4. Pumice Vesicular Glassy Texture
Felsic Composition
Very Light Weight
Extrusive
5. Rhyolite Non-Vesicular Fine Texture
Felsic Composition
Very Light Weight Pinks, White, Clear and Black
Extrusive
6. Vesicular Andesite Vesicular Fine Texture
Intermediate Composition
Gray, Tan, Brown
Extrusive
7. Scoria Vesicular Fine Texture
Intermediate Composition
Dark Brown, Grey
Extrusive
8. Andesite Non-Vesicular Fine Texture
Intermediate Composition
Grays to Brown
Extrusive
9. Basalt Non-Vesicular Fine Texture
Mafic Composition
Blacks to Greens
Extrusive
10. Granite Non-Vesicular Coarse Grained Texture
Felsic Composition
Pinks, White, Clear and Black
Intrusive
11. Diorite Non-Vesicular Coarse Grained Texture
Intermediate Composition
White, Clear, Gray and Black
Intrusive
12. Gabbro Non-Vesicular Coarse Grained Texture
Mafic Composition
White, Gray, Black and Greens
Intrusive
13. Pegmatite Non-Vesicular Very Coarse Grained Texture
Felsic Composition
Pinks, White, Clear and Black
Intrusive