Rock Identifier
Tumbled emerald chips (Emerald, green beryl (Be₃Al₂Si₆O₁₈), colored mainly by chromium and/or vanadium) — gemstone
gemstone

Tumbled emerald chips

Emerald, green beryl (Be₃Al₂Si₆O₁₈), colored mainly by chromium and/or vanadium

AI-generated identification · may be incorrect

Typically translucent to transparent, vivid green, with vitreous luster and irregular conchoidal fractures; Mohs hardness 7.5–8, hexagonal crystal structure, poor cleavage, and specific gravity about 2.67–2.78. The pieces shown may also include lower-grade green beryl or dyed material.

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Physical properties

Typically translucent to transparent, vivid green, with vitreous luster and irregular conchoidal fractures; Mohs hardness 7.5–8, hexagonal crystal structure, poor cleavage, and specific gravity about 2.67–2.78. The pieces shown may also include lower-grade green beryl or dyed material.

Formation & geological history

Forms in hydrothermal veins and metamorphic rocks where beryllium-rich fluids interact with chromium- or vanadium-bearing rocks, generally during Precambrian to younger mountain-building events. Major sources include Colombia, Zambia, Brazil, Afghanistan, and Pakistan.

Uses & applications

Used as a gemstone and in decorative specimens; small tumbled chips are commonly sold for crafts, mineral collections, and jewelry inlays. Industrial use is limited because gem-quality emerald is relatively rare.

Geological facts

Natural emerald commonly contains inclusions, known as a jardin, and flawless stones are exceptionally valuable. Tumbled fragments cannot be reliably authenticated by appearance alone.

Field identification & locations

Look for saturated green color, glassy luster, inclusions, and hardness sufficient to scratch ordinary glass; quartz and dyed glass can imitate it. Testing with magnification, refractive index, and spectroscopy is needed for confident identification.