Rock Identifier
Rough green beryl (possibly emerald) (Beryl, Be₃Al₂Si₆O₁₈; emerald is chromium- or vanadium-colored green beryl) — gemstone
gemstone

Rough green beryl (possibly emerald)

Beryl, Be₃Al₂Si₆O₁₈; emerald is chromium- or vanadium-colored green beryl

AI-generated identification · may be incorrect

Translucent blue-green, vitreous luster, with an elongated prismatic habit; beryl has Mohs hardness 7.5–8, hexagonal crystals, and poor basal cleavage. The image alone cannot confirm whether the color qualifies as emerald.

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Physical properties

Translucent blue-green, vitreous luster, with an elongated prismatic habit; beryl has Mohs hardness 7.5–8, hexagonal crystals, and poor basal cleavage. The image alone cannot confirm whether the color qualifies as emerald.

Formation & geological history

Forms in pegmatites and hydrothermal veins, where beryllium-rich fluids interact with suitable host rocks; specimens may range from ancient to geologically recent depending on deposit.

Uses & applications

Gem-quality material is cut for jewelry; lower-grade beryl is collected as a mineral specimen and occasionally used as an industrial source of beryllium.

Geological facts

Beryl’s color varies with trace elements: chromium or vanadium can produce emerald green, while iron commonly gives blue-green tones.

Field identification & locations

Look for a six-sided prismatic crystal, vitreous surface, and hardness sufficient to scratch glass; prominent deposits occur in Colombia, Brazil, Zambia, and elsewhere. Color and appearance here are insufficient to identify emerald conclusively.