mineral
Aquamarine
Beryl (Be3Al2Si6O18)
AI-generated identification · may be incorrectHardness: 7.5-8.0 (Mohs); Color: Pale blue to light green; Luster: Vitreous; Crystal Structure: Hexagonal; Cleavage: Indistinct; Specific Gravity: 2.66-2.80
- Hardness
- 7
- Color
- Pale blue to light green
- Luster
- Vitreous
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Physical properties
Hardness: 7.5-8.0 (Mohs); Color: Pale blue to light green; Luster: Vitreous; Crystal Structure: Hexagonal; Cleavage: Indistinct; Specific Gravity: 2.66-2.80
Formation & geological history
Forms in regional metamorphic rocks and igneous pegmatites. The blue color is caused by trace amounts of ferrous iron (Fe2+). Usually found in pockets within granite pegmatites.
Uses & applications
Primarily used as a gemstone in jewelry. Industrial uses include as a source of beryllium for specialized metal alloys in aerospace and defense.
Geological facts
The largest gem-quality aquamarine ever mined was found in Brazil in 1910 and weighed 243 lbs. It is the birthstone for March. Most sky-blue aquamarine on the market is heat-treated to remove green tones.
Field identification & locations
Identify by its hexagonal prismatic shape (if uncut), high hardness, and distinct glassy luster. Commonly found in Brazil, Pakistan, and Madagascar. Collectors look for clarity and saturation of color.
