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.
Minerals and precious stones: Earthâs jewels. Most minerals on Earth are formed when magma rises from the depths of the planet to the surface and then cools.dentifying minerals. Geologists are scientists who study the materials that make up the planet. To identify and classify the minerals in rocks, geologists examine a number of features, such as hardness, transparency, form and structure, color, streak color, and sparkle.