Ilvaite specimens for sale

Ilvaite is a calcium iron silicate mineral that forms in monoclinic crystals and compact masses. It typically presents a dark brown to black to olive-green color with a glassy to sub-metallic lustre and a somewhat vitreous appearance. The mineral commonly occurs in hydrothermal veins and skarn deposits, often intergrown with magnetite, calcite, and other iron-rich minerals, producing clusters that are attractive to collectors for their distinctive elongated prismatic habits. Superior specimens show well-formed crystals with sharp terminations and occasional black, metallic surfaces that catch the light in cabinet displays.