| 11. | There is a large mass of rhyolite located near the creek.
|
| 12. | Where unoxidized the rhyolite contains abundant pyrite, chalcopyrite and chalcocite.
|
| 13. | Main rocks of the peak are trachyte, rhyolite and basalt.
|
| 14. | Volcanic rocks of Kurile Lake range from basaltic andesite to rhyolite.
|
| 15. | Violet-red spessartines are found in rhyolites in Colorado and Maine.
|
| 16. | Mount Ngungun ( 253m ) is composed of alkali rhyolite.
|
| 17. | Mount Tibberoowuccum ( 220m ) is composed of alkali rhyolite.
|
| 18. | The andesite and monzonite are cut by dikes of dacite and rhyolite.
|
| 19. | The rhyolite in the canyon contains a variety of different iron compounds.
|
| 20. | The second and third intervals saw eruptions of great quantities of rhyolites.
|
