Riebeckite specimens for sale

Riebeckite is a blue to green amphibole mineral that forms in elongated prismatic crystals and fibrous aggregates. It typically exhibits a vitreous to silky lustre and a smooth to slightly striated surface, with color ranging from deep blue to greenish blue in well-formed crystals. The mineral commonly occurs in igneous and metamorphic environments, often associated with other riebeckite-bearing rocks and metasomatized assemblages. Notable specimens have come from classic localities in Pakistan, Brazil, the United States, South Africa, and Afghanistan, where cavity fillings and fracture fills reveal its characteristic needle-like or blade-like crystals within host rocks.