Identify the following igneous rocks based on their texture and mineral content
What will be an ideal response?
a. Fine-grained rock with 0% quartz, 0% potassium feldspar, 61% plagioclase feldspar, 13% biotite, 17% amphibole, 9% pyroxene, 0% olivine
b. Fine-grained rock with 0% quartz, 0% potassium feldspar, 67% calcium-rich plagioclase feldspar, 0% biotite, 0% amphibole, 25% pyroxene, 8% olivine
c. Coarse-grained rock with 0% quartz, 0% potassium feldspar, 52% calcium-rich plagioclase feldspar, 0% biotite, 0% amphibole, 32% pyroxene, 16% olivine
d. Coarse-grained rock with 0% quartz, 0% potassium feldspar, 0% plagioclase feldspar, 0% biotite, 0% muscovite, 0% amphibole, 56% pyroxene, 44% olivine
e. Fine-grained rock with 32% quartz, 26% potassium feldspar, 26% sodium-rich plagioclase feldspar, 5% biotite, 11% amphibole, 0% pyroxene, 0% olivine
By reference to text Figure 4.3: Andesite, Basalt, Gabbro, Peridotite, Rhyolite
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