Mineral growth in magmas at the surface with temperatures around 1,000 to 1,200°C occurs in the following way
A. Iron and magnesium will link up with aluminum and the silicon-oxygen tetrahedron as magma temperature decreases to sequentially form four distinct and discontinuous families of minerals-olivine, pyroxene, amphibole, and biotite mica.
B. Both of these are correct.
C. Calcium will combine with aluminum and the silicon-oxygen tetrahedron to begin forming the plagioclase feldspar family, a continuous and gradational series of minerals.
D. None of these choices are correct.
Answer: B
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