An aphanitic rock containing about 30% calcium-rich plagioclase feldspar, about
ID: 153375 • Letter: A
Question
An aphanitic rock containing about 30% calcium-rich plagioclase feldspar, about 55% pyroxene, and 15% olivine
A phaneritic rock containing about 20% quartz, 40% potassium feldspar, 20% sodium-rich plagioclase feldspar, a few percent muscovite, and the remainder dark colored silicate.
An aphanitic rock containing about 50% plagioclase feldspar, about 35% amphibole, 10% pyroxene, and minor amounts of other light-colored silicates.
A phaneritic rock made mainly of olivine and pyroxene, with lesser amounts of calcium-rich plagioclase feldspar.
Explanation / Answer
An aphanitic rock containing about 30% calcium-rich plagioclase feldspar, about 55% pyroxene, and 15% olivine=OIivine basalt
phaneritic rock with 20% quartz, 40% potassium feldspar, 20% sodium-rich plagioclase feldspar, =Quartz Monzodiorie
aphanitic rock with 50% plagioclase feldspar,35% amphibole, 10% pyroxene=Andesite
A phaneritic rock with olivine and pyroxene, with lesser amounts of calcium-rich plagioclase feldspar=Dunite