| 41. | They consist essentially of feldspar with hornblende ( generally of brown color ) and pale pyroxene.
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| 42. | Phenocrysts are dominated by plagioclase; in the latter stages of activity biotite dominates over pyroxene.
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| 43. | The pyroxene is, yellow or green, and is surrounded by formless areas of nepheline.
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| 44. | Feldspar, amphiboles, pyroxenes, and volcanic glass are the principle donors of clay minerals.
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| 45. | Pyroxene andesite is the dominant component.
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| 46. | In meteorites it occurs with perovskite, melilite, hibonite, spinel and calcium rich pyroxene.
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| 47. | The tholeiite contains plagioclase and pyroxene.
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| 48. | Thin section analysis revealed that the crystals are mostly plagioclase, with some pyroxene and olivine.
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| 49. | They contain hornblende and pyroxene with a total content of 58-61 % of SiO 2.
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| 50. | The first minerals to form in this ocean were the iron and magnesium silicates olivine and pyroxene.
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