A dodo egg is a renewable food item that is randomly left behind by a dodo bird. Dodo eggs are large and oval in appearance with a light blue shell with a wavy pattern or darker areas.
As a result, rocks form quickly and mineral crystals are very small. Rhyolite is one type of rock that is formed when lava cools. It contains similar minerals to granite. However, as you can see in Figure 3.21, the mineral crystals are much smaller than the crystals in the granite shown in Figure 3.20.
Kinds of Metamorphic Rocks. 1  Slate - low grade metamorphosed shale; very fine grained; slaty cleavage should not be confused with bedding planes. 2  Phyllite - next step up from slate, larger mica grains give the rock a luster.  Schist - a strongly foliated rock with large grains of platy minerals.