arfvedsonite
arfvedsonite, amphibole mineral, an iron-rich sodium silicate. Lithium and magnesium replace iron in the structure to form eckermannite. Both minerals characteristically occur as dark-green crystals in alkali igneous rocks and their associated pegmatites. For chemical formula and detailed physical properties, see amphibole (table).
This article was most recently revised and updated by Amy Tikkanen.
Citation Information
Article Title:
arfvedsonite
Website Name:
Encyclopaedia Britannica
Publisher:
Encyclopaedia Britannica, Inc.
Date Published:
25 January 2018
Access Date:
November 13, 2026