mineral

Green beryl (likely heliodor)

Beryl, Be₃Al₂Si₆O₁₈; yellow-green varieties are heliodor or golden beryl

AI-generated identification · may be incorrect

Transparent to translucent, pale yellow-green, vitreous luster, and elongated prismatic hexagonal crystals with lengthwise striations and imperfect basal cleavage. Mohs hardness 7.5–8; specific gravity about 2.63–2.80. The apparent flat faces and uniform shape may indicate a cut or polished crystal.

Identified September 1, 2026More mineral →

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Physical properties

Formation & geological history

Forms in granitic pegmatites and hydrothermal cavities when beryllium-rich fluids crystallize; typically associated with quartz, feldspar, and mica. Crystals range from Precambrian to younger Phanerozoic pegmatite systems.

Uses & applications

Transparent material may be cut as a gemstone; less gemmy crystals are collector specimens or sources of beryllium. Common rough pieces generally have modest value, while clean facetable heliodor can be valuable.

Geological facts

Beryl’s color is controlled by trace elements: iron produces heliodor, chromium or vanadium produces emerald, and manganese produces morganite. It is related to aquamarine and emerald.

Field identification & locations

Check for a hexagonal prism, longitudinal striations, glassy luster, and hardness sufficient to scratch ordinary glass; avoid confusing it with fluorite or glass. Common sources include Brazil, Madagascar, Namibia, Ukraine, and the United States.