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.
Thus, of the eight common igneous minerals, only quartz, K-feldspar, and muscovite are commonly seen in sedimentary rocks. These minerals are joined in sedimentary rocks by clay minerals, calcite, dolomite, gypsum, and halite. The clay minerals form during mineral weathering.The other four minerals are salts that precipitate as water evaporates. The elemental constituents of these salts are ultimately also derived from mineral weathering.yrite is not a rock-forming mineral, but it is commonly present in sedimentary rocks that formed in or near seawater (oceans, lagoons, and coastal swamps). Quartz, Chert, and Flint K-Feldspar Muscovite and Clay Minerals Calcite/ Dolomite Gypsum Halite Pyrite Go back to Common Minerals page Return to Home Page.