description Actinolite Overview
Actinolite is a calcium magnesium iron amphibole mineral that forms a compositional series with tremolite. It commonly occurs in metamorphic rocks, especially rocks formed when magnesium- and calcium-rich materials are altered during metamorphism. Actinolite may appear green, gray-green, or nearly black and can form elongated or fibrous crystals. Fine-grained actinolite-tremolite aggregates are components of some nephrite jade, although actinolite itself is not synonymous with all nephrite.
help Actinolite FAQ
What is actinolite?
Actinolite is a calcium magnesium iron amphibole mineral. It forms a compositional series with tremolite and commonly appears green.
Where does actinolite form?
Actinolite commonly occurs in metamorphic rocks formed when magnesium-rich and calcium-rich materials are altered during metamorphism. Its presence can therefore help describe the conditions under which a rock changed.
What color is actinolite?
Actinolite may appear green, with shades influenced by its iron and magnesium content. Individual crystals can range from pale green to darker green.
How is actinolite related to tremolite?
Actinolite and tremolite form a compositional series within the amphibole group. The main difference is the balance of iron and magnesium in their chemical composition, with actinolite generally containing more iron.
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