vivid emerald-green crystals with glassy luster, often on white calcite or quartz; highly collectible due to color, clarity, and brittleness.
Regional guide
Dioptase from Altyn‑Tyube dioptase deposit, Kazakhstan
Altyn-Tyube dioptase, Kazakhstan - the type locality famed for emerald-green crystals, intense glow, and copper-oxide associations prized by collectors.
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