Identification Fluorite Identification Sheet The mineral that gave fluorescence its name — and comes in nearly every color imaginable.
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 Calcite Identification Sheet How to confirm calcite using hardness, cleavage, and the dilute-acid reaction test.
Identification Quartz Identification Sheet Field identification cues for quartz and its common varieties, with a decision path for separating it from lookalikes.
