Actinolite — a green amphibole mineral of metamorphic rocks Actinolite Actinolite is an amphibole mineral commonly green to black, found in metamorphic rocks. It ranges from crystalline specimens to fibrous forms, and is related to tremolite and nephr…
Rock cycle: how Earth's rocks form, change, and interact Rock cycle Overview of the rock cycle: the processes that transform igneous, sedimentary and metamorphic rocks; main mechanisms, environments, timescales, and why the cycle matters for landsc…
