mineral

Aquamarine

Beryl (Be3Al2Si6O18 with Iron traces)

Hardness: 7.5-8.0 on Mohs scale; Color: Pale blue to light green; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: Imperfect/Poor; Specific Gravity: 2.66-2.80

Hardness: 7
Color: Pale blue to light green
Luster: Vitreous (glassy)

Identified May 18, 2026More mineral →

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Physical properties

Hardness: 7.5-8.0 on Mohs scale; Color: Pale blue to light green; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: Imperfect/Poor; Specific Gravity: 2.66-2.80

Formation & geological history

Formed in granitic pegmatites and hydrothermal veins. The blue color is often caused by trace amounts of ferrous iron (Fe2+) trapped in the silicate structure during cooling of magma-enriched fluids.

Uses & applications

Widely used as a gemstone in high-end jewelry (rings, earrings, necklaces) and highly valued by mineral collectors for its clarity and color.

Geological facts

Aquamarine is the birthstone for March. Historically, sailors carried it to ensure safe passage across the sea and to prevent seasickness. It is the official state gem of Colorado.

Field identification & locations

Identify by its distinct hexagonal crystal habit (if not tumbled), sea-blue color, and high hardness (it will scratch glass). Commonly found in Brazil, Pakistan, and Madagascar. Look for it in weathered granite areas.