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 Malachite Identification Sheet A bright green copper carbonate recognized by its color, concentric banding, botryoidal habit, and effervescence in acid.
Identification Feldspar Identification Sheet The mineral that makes up 60% of the Earth's crust — and still trips up new collectors.
