| 21. | Labradorite is the principal component of the igneous rock type anorthosite.
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| 22. | When it has stopped moving, lava solidifies to form igneous rock.
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| 23. | Lone Cone is composed of igneous rock of the Catface Intrusions.
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| 24. | By definition rock formed of solidified magma is called igneous rock.
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| 25. | These elements are major components of the minerals comprising igneous rocks.
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| 26. | This molten rock magma then cools and crystallizes, forming igneous rocks.
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| 27. | However both are derived from the alteration of igneous rocks.
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| 28. | Bornhardts are typically composed of igneous rocks, for example granites.
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| 29. | The most common igneous rock type is porphyritic hornblende diorite.
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| 30. | In slowly cooled intrusive igneous rocks, pigeonite is rarely preserved.
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