Identification Magnetite Identification Sheet The strongly magnetic iron oxide: black streak, octahedral crystals, and a pull on the pocket magnet no lookalike can match.
Identification Hematite Identification Sheet The most important iron ore, identified by its diagnostic reddish-brown streak regardless of the specimen's outward color.
Identification Turquoise Identification Sheet One of the world's oldest ornamental stones — and one of the most frequently faked.
Identification Obsidian Identification Sheet Volcanic glass that looks like a mineral but technically isn't — and produces the sharpest natural edges known.
