Composition of igneous rocks

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  • 1. Name: __________________________ Date: ___________ Period:________ Composition of Igneous RocksDirections: Using your knowledge of Earth Science and the Scheme forIgneous Rock Identification chart on page 6 of your ESRT, answer thefollowing questions.1. A sample of periodite was found to be 20% pyroxene, what percentage of the rock is olivine?2. A sample of granite was found to be 50% potassium feldspar, what percentage of the rock is quartz, plagioclase feldspar, biotite, and amphibole.3. A sample of rhyolite was found to be 15% amphibole, what percentage of the rock is potassium feldspar, quartz, plagioclase feldspar, and biotite.4. A sample of gabbro was found to be 15% plagioclase feldspar, what other minerals are present and what percentage of the rocks composition do they make up?