Identification Beryl (Aquamarine and Emerald) Identification Sheet The beryllium silicate behind emerald, aquamarine, and morganite: long hexagonal prisms, harder than quartz, in pegmatites.
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 Onyx Identification Sheet A banded chalcedony with a parallel-layered structure, a hardness that outlasts most imposters, and — in this particular library — a name…
Identification Olivine (Peridot) Identification Sheet The green mineral that makes up much of the Earth's mantle — and surfaces as gemstone peridot when conditions align.
Identification Amethyst Identification Sheet The purple quartz that has captivated collectors and jewelers for millennia — and fades if you leave it on the windowsill.
Identification Garnet Group Identification Sheet Not one mineral but a family — hard, dense, and found in almost every metamorphic rock Rockies encounter.
Identification Feldspar Identification Sheet The mineral that makes up 60% of the Earth's crust — and still trips up new collectors.
Identification Pyrite (Fool's Gold) Identification Sheet How to tell pyrite from actual gold — and why every newcomer gets fooled at least once.
Identification Quartz Identification Sheet Field identification cues for quartz and its common varieties, with a decision path for separating it from lookalikes.
