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The golden calcite associated with this shop’s Ohio material traces back to a much smaller, more specific source than “Ohio”

Herkimer diamonds all come from a strikingly narrow band of rock in central New York’s Mohawk Valley, and the reason

Round, unusually smooth rocks turn up often enough in gravel beds and eroding cliffs that they get mistaken for almost

Rhythmic layering shows up across a surprising range of unrelated minerals and rocks, malachite’s green rings, travertine’s warm bands, agate’s

Granite and basalt can start from remarkably similar magma chemistry and still end up looking nothing alike, one coarse and

Some of the most common minerals on Earth, and a few genuinely striking ones, owe their existence to something disappearing

Metamorphic rock forms without melting, heat and pressure reorganizing a rock’s minerals and texture while it stays solid the entire

Every rock on the shelf, no matter how solid it looks, is really a temporary stop in an extremely slow,

A huge share of the world’s crystal specimens, and most of its metal ore, formed the same basic way: hot

Pegmatites are responsible for a disproportionate share of the largest, cleanest crystals ever found, gemstone-grade beryl, tourmaline, and quartz specimens