There are over 5,000 known types of minerals. Just a few minerals make up most of the rocks we see, though: feldspars, amphiboles, quartz, olivine, garnet, micas, calcite, and pyroxenes.

The mineral amphibole is made up of tetrahedral and octahedral structures linked together in a way that creates a series of rings. New research suggests those rings -- called A-sites -- could ...

What FACTS ABOUT ROCKS do you know? They are abundant on earth, and yet little is known about them. These facts will increase your knowledge of the rocks.