Exercise 2. Crystalline igneous rocks are classified based on composition and texture. Fine Coarse 25 75 100 Low density (2:5 g/cm3) K-feldspar Na 70% Silicic Rhyolit Granite Quartz 900 % 600 C Biotite 60% Intermediate Diorite Plagioclase Amphibole Andesite 1,050%C Density Silica content Eruption temperature Ca Pyroxene 1.160 C 50% Mafic Basalt Gabbro (Augito) 40% Ultramafic Komatiito Peridotite Olivine (Picrite) The right side of the chart High density shows the percentages of (3.4 g/cm ) different minerals in the different rock types, (a) Using the figure above, which minerals in the Rhyolit (b) Using the figure above, this rock is a coarse-grained rock and contain mostly plagioclas e (~76%), amphibole and trace amounts of quartz, and augite. What is this rock? (c) Which is coarse-grained, mafic rock? Which minerals are inside of that rock? (d) Using the figure above, which one is not true? a. If the rock's density increases, the rock's melting temperature will be increased. b. If the rock's silica content increases, the rock's density will be increased. c. Basalt and Gabbro are mafic rocks. d. Komatiite and Peridotite contain lots of olivine