mineral
Aquamarine-bearing quartz specimen
Beryl (Be₃Al₂Si₆O₁₈), likely aquamarine, on quartz (SiO₂)
AI-generated identification · may be incorrectBlue-green, translucent to transparent prismatic beryl crystals occur on a massive, glassy white-to-pink quartz matrix. Beryl has Mohs hardness 7.5–8, vitreous luster, hexagonal crystals, and poor basal cleavage; quartz is hardness 7.
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Physical properties
Blue-green, translucent to transparent prismatic beryl crystals occur on a massive, glassy white-to-pink quartz matrix. Beryl has Mohs hardness 7.5–8, vitreous luster, hexagonal crystals, and poor basal cleavage; quartz is hardness 7.
Formation & geological history
Typically forms in miarolitic cavities and pegmatites from late-stage, water-rich granitic magma, generally during the Precambrian to Phanerozoic. The specimen appears natural and uncut, though image resolution limits certainty.
Uses & applications
Gem-quality aquamarine is cut for jewelry; non-gem material is collectible, and quartz-bearing pegmatite specimens are used for education and display.
Geological facts
Aquamarine’s blue-green color is caused mainly by iron impurities. Heating can remove green tones and produce a purer blue gem color.
Field identification & locations
Identify aquamarine by its blue-green hexagonal prisms, hardness, and association with coarse quartz and feldspar in pegmatites; common sources include Brazil, Pakistan, Afghanistan, Madagascar, and Colorado.
