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

Environmental & Atmospheric Sciences

You might also like to view...

Which of the following entered the core after having been in the periphery?

A) Canada B) Mexico C) Brazil D) Portugal E) Thailand

Environmental & Atmospheric Sciences

The U.S. government estimates ________ percent of the homeless are children

A) 5 B) 10 C) 15 D) 25 E) 40

Environmental & Atmospheric Sciences

Continental crust is mainly composed of ________, whereas oceanic crust is mainly composed of ________

A) olivine; basalt B) limestone; gabbro C) granite; basalt D) gabbro; granite

Environmental & Atmospheric Sciences

Tropical savanna climate regions are usually not well suited to agriculture

a. True b. False Indicate whether the statement is true or false

Environmental & Atmospheric Sciences