| 31. | Tuff can be classified as either sedimentary or igneous rocks.
|
| 32. | Examples of phaneritic igneous rocks are gabbro, diorite and granite.
|
| 33. | These minerals are typical weathering products of mafic igneous rocks.
|
| 34. | Quartz veins and igneous rocks form most of its geology.
|
| 35. | Granite is one of the hardest types of igneous rock.
|
| 36. | Igneous rocks in the Big Smoky Valley are predominantly pre-Quaternary.
|
| 37. | THEMIS found a wide range of igneous rocks and minerals.
|
| 38. | Examples of aphanitic igneous rock include basalt, andesite and rhyolite.
|
| 39. | Its igneous rock consists mostly of pyroxenite and gabbro.
|
| 40. | Also, potassium-argon dating is used to date igneous rocks.
|
