Rock Identifier
Faceted blue gemstone, likely aquamarine (Aquamarine—blue beryl, Be₃Al₂Si₆O₁₈; identification is uncertain from the image alone) — gemstone
gemstone

Faceted blue gemstone, likely aquamarine

Aquamarine—blue beryl, Be₃Al₂Si₆O₁₈; identification is uncertain from the image alone

AI-generated identification · may be incorrect

Pale blue, transparent, vitreous luster, faceted crystal; Mohs hardness 7.5–8, hexagonal crystal structure, poor-to-indistinct cleavage, specific gravity about 2.68–2.80. The blue color commonly results from iron impurities.

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Physical properties

Pale blue, transparent, vitreous luster, faceted crystal; Mohs hardness 7.5–8, hexagonal crystal structure, poor-to-indistinct cleavage, specific gravity about 2.68–2.80. The blue color commonly results from iron impurities.

Formation & geological history

Forms in lithium- and beryllium-rich granite pegmatites, where crystals grow in cavities over geologic timescales, commonly hundreds of millions to billions of years old. Major sources include Brazil, Pakistan, Afghanistan, Nigeria, Madagascar, and Mozambique.

Uses & applications

Cut aquamarine is used in jewelry; unusually clear crystals are prized by collectors. Beryl varieties also have limited industrial beryllium significance, though gem material is primarily ornamental.

Geological facts

Aquamarine is the blue variety of beryl and is the March birthstone. Heat treatment may intensify or lighten its blue color; similar-looking materials include blue topaz, glass, and synthetic stones.

Field identification & locations

Check for natural inclusions, strong pleochroism, refractive index, and hardness; a gemological refractometer or spectroscopy is needed for confirmation. Typical faceted stones range from $50–$300 per carat, while fine large stones may exceed $1,000 per carat.