Chalcedonies include many types of cryptocrystalline quartz ... Silicates—including quartz, mica, olivine, and precious minerals such as emeralds—are the most common class of minerals, as ...

In Madagascar, thousands of adults and children risk their lives mining for a shiny mineral called mica. It's found in electronics, cars, planes, and even paint. But even though mica is found in ...

The film also covers the formation of different types of rocks—igneous ... Keywords rocks, minerals, granite, feldspar, quartz, mica, x-ray diffraction, igneous rocks, sedimentary rocks ...