Three igneous rocks have the following characteristics: feldspar 70%, quartz 15%, amphibole 5%, biotite 10% 0.1 m. all crystals less than b. feldspar 45%, amphibole 20% , pyroxene 35%-all crystals between 0.5 and feldspar 40% (crystals greater than 10 mm), amphibole 30% and feldspar 30%) (crystals between 0.5 and 1 mm). c use the diagram below to you name the three rocks. (9 marks) c. b. a. mafi̇c ultramafic felsic intermediate 100 biotite and/or amphibole 90 albite 70 u 60 s0 o 40 2 30 pyroxene quartz : plagioclase feldspar 10- k-feldspar granitediorte peridotite gabbro basalt komatiite andesite extrusive: rhyolite