Rocks, Minerals & Ores
Metamorphic Rocks and Minerals
Actinolite
Calcium magnesium iron silicateOwens Valley, Mono County, CA
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Metamorphic Rocks and Minerals
Actinolite is a green to dark green mineral belonging to the amphibole group, composed of calcium, magnesium, and iron silicate. It typically forms in metamorphic environments, such as those found in Owens Valley, Mono County, California. Actinolite often appears as fibrous or bladed crystals and can be associated with greenschist facies rocks. Its coloration and crystal habit make it both a valuable geological indicator and a visually appealing specimen for collectors.