| 21. | It also is found in metamorphic amphibolites and as a detrital component of some sediments.
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| 22. | The summit itself is composed of amphibolites.
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| 23. | A shield is that part of the metamorphosed greenschist, amphibolite, and granulite facies.
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| 24. | Oligoclase is also found in metamorphic rocks formed under transitional greenschist to amphibolite facies conditions.
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| 25. | Paragneisses and amphibolites are most abundant, but low grade metamorphic rock is also present.
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| 26. | It may grow on amphibolite or diabase.
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| 27. | Rocks typical of the region include schist, amphibolite, gneiss, migmatite, and granite.
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| 28. | This rock unit is formed by quartzites, meta-black shales, amphibolites and skarns.
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| 29. | Amphibolite is a grouping of rocks composed mainly of amphibole and plagioclase feldspars, with little or no quartz.
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| 30. | These hilltops are often crowned by outcrops of exposed metamorphic rocks such as marble, amphibolite, and serpentine.
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