Arfvedsonite is defined as a black monoclinic amphibole, containing sodium and silicon trioxide with occluded water and some calcium. It can also be a black or greenish-black mineral of the amphibole group, found in igneous and metamorphic rocks. Arfvedsonite can be further defined as amphibole mineral, an iron-rich sodium silicate.
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what is the definition of arfvedsonite
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