E N D
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