gemstone
Tumbled aquamarine
Beryl, Be₃Al₂Si₆O₁₈ (blue-green variety)
AI-generated identification · may be incorrectHardness 7.5–8 Mohs; pale blue-green color, vitreous luster, and hexagonal crystal structure. This appears tumbled and polished, with internal fractures or inclusions; cleavage is poor, and specific gravity is about 2.68–2.80.
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Physical properties
Hardness 7.5–8 Mohs; pale blue-green color, vitreous luster, and hexagonal crystal structure. This appears tumbled and polished, with internal fractures or inclusions; cleavage is poor, and specific gravity is about 2.68–2.80.
Formation & geological history
Aquamarine crystallizes in granite-related pegmatites and hydrothermal veins as magma cools, commonly during the Precambrian to Phanerozoic. Its color comes mainly from trace iron in beryl.
Uses & applications
Used as a faceted gemstone, cabochon, ornamental stone, and collector specimen; exceptionally clear material is valuable in jewelry.
Geological facts
Aquamarine is the blue to blue-green member of the beryl family, which also includes emerald, morganite, and heliodor. Stronger blue color generally increases value.
Field identification & locations
Identify it by its blue-green hue, glassy luster, hardness, and hexagonal beryl crystals; distinguish it from glass or dyed quartz with gemological testing. Important sources include Brazil, Pakistan, Afghanistan, Nigeria, Madagascar, and Russia.
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