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Raunak Mitra posted an Question
January 19, 2022 • 21:26 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
Q37.a porphyritic igneous rock contains phenocrysts of olivine and calcium-rich plagioclase in an aphanitic groundmass. this is a o andesite porphyry obasalt po
Q37.A porphyritic igneous rock contains phenocrysts of olivine and calcium-rich plagioclase in an aphanitic groundmass. This is a O andesite porphyry Obasalt porphyry Ogabbro porphyry O rhyolite porphyry
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Mayank sagar Best Answer
Gabbro is composed of pyroxene and calcium-rich plagioclase, with minor amounts of hornblende, olivine. Basalt is rich in iron and magnesium and is mainly composed of olivine, pyroxene, and alkali plagioclase. andesite is andesine (a plagioclase feldspar) and one or more ferromagnesian minerals, such as pyroxene or biotite . and end Rhyolite with no olivine it is composed of Potassium Feldspar, Quartz, Sodium Plagioclase, Biotite, Hornblende