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In daylight, a mineral waits. Under ultraviolet light, hidden color wakes inside it. Here is the science behind fluorescent minerals and how to view them safely.

Selenite and satin spar are mineral sisters, both made of gypsum, but one grows in clear blades while the other gathers light into silky fibers. Here is how to tell them apart.

Ammonites carried their homes through ancient seas, adding one chamber after another as they grew. Millions of years later, their stone spirals still hold a map of vanished oceans.

Raw stone preserves the shape of growth. Polished stone opens a window for light. Neither is better; they simply tell different parts of the story.

Dragon’s Blood Quartz looks as if clear stone learned to hold embers. The name is poetic; the mineral story beneath it is quartz and iron.

Obsidian looks like a crystal, breaks like glass, and sometimes keeps entire rainbows inside its darkness. Here is the geology behind the glow.

A star sleeps inside certain rose quartz, invisible until the stone, the light, and the viewer find the same angle. Here is the science behind its awakening.

Long before fields and highways, warm seawater covered Ohio. Some of its corals survived as stone, and some grew a second secret life lined with quartz.

Water is gentle to us, but it is not gentle to every stone. Learn how hardness, cleavage, crystal habit, and chemistry should guide the way you clean and display a mineral specimen.