mineral
Raw greenish beryl (probable aquamarine)
Beryl, Be₃Al₂Si₆O₁₈; blue varieties are aquamarine
AI-generated identification · may be incorrectPale blue-green, vitreous luster, commonly hexagonal crystals with imperfect cleavage; Mohs hardness 7.5–8 and specific gravity about 2.63–2.80. The small rough crystal appears heavily included or weathered, so exact identification requires testing.
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Physical properties
Pale blue-green, vitreous luster, commonly hexagonal crystals with imperfect cleavage; Mohs hardness 7.5–8 and specific gravity about 2.63–2.80. The small rough crystal appears heavily included or weathered, so exact identification requires testing.
Formation & geological history
Forms mainly in miarolitic cavities of granitic pegmatites during late-stage cooling, typically in Precambrian to younger continental crust. Trace iron produces aquamarine’s blue-green color.
Uses & applications
Transparent aquamarine is cut for jewelry; opaque or fractured material is mainly a collector specimen. Beryl is also an important beryllium ore, though gem-quality pieces are rarely used industrially.
Geological facts
Aquamarine is the March birthstone and can be heat-treated to intensify blue color. Its characteristic hexagonal crystal habit helps distinguish it from quartz and feldspar.
Field identification & locations
Look for a hard, glassy, pale blue-green crystal and a hexagonal cross-section; it should scratch glass but not be scratched by ordinary steel. Common sources include Brazil, Pakistan, Afghanistan, Madagascar, Russia, and the United States.
