| 31. | For example, porphyritic andesite will have large phenocrysts of plagioclase in a fine-grained matrix.
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| 32. | Most is strongly deformed, but least-deformed areas show a relict porphyritic to equigranular texture.
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| 33. | The porphyritic trachytes erupted at the summit of the shield and flowed towards the northeast and east.
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| 34. | "Porphyritic " textures develop when conditions during cooling of a magma change relatively quickly.
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| 35. | Porphyritic plagioclase andesite of the youngest unit underlies much of the southern and western portions of Meager.
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| 36. | The surrounding loose rock was cleared away by the ice sheet leaving the hard porphyritic core behind.
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| 37. | Gneiss is the predominant rock with a few granite Porphyritic matrices occasionally occur in the rock formations.
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| 38. | Aphanites are commonly porphyritic, having large crystals embedded in the fine groundmass or inclusions are called phenocrysts.
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| 39. | The sequence has been divided into a lower pillowed tholeiitic unit and an upper porphyritic alkali basalt unit.
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| 40. | The hamlet of Bluestone is named after a granite boulder porphyritic crystals, which are no longer visible.
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