| 41. | The Lobster Creek Volcanics is actually an intrusion of plagioclase pyroxene hornblende porphyry from.
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| 42. | The mantle is made from glass, that partially devitrified into pyroxene and plagioclase.
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| 43. | Amphibole crystals are enclosed in intersitital plagioclase crystals and sometimes contain secondary biotite crystals.
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| 44. | Magma mixing and plagioclase crystallization occurred in it.
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| 45. | If more than 90 % plagioclase is present, then the rock is an anorthosite.
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| 46. | Porphyritic dacites contain blocky highly zoned plagioclase phenocrysts and / or rounded corroded quartz phenocrysts.
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| 47. | Their essential minerals are pyroxene, plagioclase and garnet : chemically they resemble the gabbros.
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| 48. | With an increase in calcic plagioclase and mafic minerals the rock type becomes a diorite.
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| 49. | However, microcline is commonly poikilitic, with abundant fine-grained plagioclase and quartz.
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| 50. | The Caolingshan Basalt consists of olivine and pyroxene, with crystals of biotite and plagioclase.
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