| 31. | Tuff can be classified as either sedimentary or igneous rocks.
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| 32. | Examples of phaneritic igneous rocks are gabbro, diorite and granite.
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| 33. | In slowly cooled intrusive igneous rocks, pigeonite is rarely preserved.
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| 34. | THEMIS found a wide range of igneous rocks and minerals.
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| 35. | Quartz veins and igneous rocks form most of its geology.
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| 36. | Granite is one of the hardest types of igneous rock.
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| 37. | Igneous rocks in the Big Smoky Valley are predominantly pre-Quaternary.
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| 38. | Examples of aphanitic igneous rock include basalt, andesite and rhyolite.
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| 39. | He noted Andean-trending structures and discovered alkaline igneous rocks.
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| 40. | Cassiterite is a widespread minor constituent of igneous rocks.
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