Field Guides Desert Evaporites: Halite, Gypsum, and Playa Minerals A pocket reference to the minerals of dry lakes and salt flats: halite, gypsum, and the borates, and how playa crusts form.
Identification Halite (Rock Salt) Identification Sheet Common rock salt: cubic crystals, perfect cubic cleavage, and the only identification sheet where the taste test is the approved test.
Field Guides Reading Rocky Mountain Geology in the Field A regional primer on the rock units, structures, and collecting settings members encounter across the Mountain West.
Identification Selenite (Gypsum) Identification Sheet A very soft sulfate you can scratch with a fingernail, forming clear bladed crystals, satin spar, and desert roses.
Identification Hematite Identification Sheet The most important iron ore, identified by its diagnostic reddish-brown streak regardless of the specimen's outward color.
Identification Calcite Identification Sheet How to confirm calcite using hardness, cleavage, and the dilute-acid reaction test.
