mineral
Aquamarine with feldspar and black tourmaline
Beryl (Be₃Al₂Si₆O₁₈), likely with feldspar and schorl (black tourmaline)
AI-generated identification · may be incorrectThe photo shows pale blue-green, elongated prismatic crystals with a vitreous luster on a light matrix, alongside dark crystals. Beryl has hardness 7.5–8, hexagonal crystal structure, and poor basal cleavage; exact identification is uncertain from the image alone.
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Physical properties
The photo shows pale blue-green, elongated prismatic crystals with a vitreous luster on a light matrix, alongside dark crystals. Beryl has hardness 7.5–8, hexagonal crystal structure, and poor basal cleavage; exact identification is uncertain from the image alone.
Formation & geological history
Likely formed in a granitic pegmatite, where late-stage, volatile-rich magma allowed large crystals to grow. Pegmatites formed at varied geological ages; the specimen’s age and locality cannot be determined from the photo.
Uses & applications
Aquamarine is cut for jewelry; beryl and associated minerals are collected as specimens. Feldspar is widely used in glass and ceramics.
Geological facts
Aquamarine is the blue to blue-green variety of beryl; iron impurities produce its color. Dark inclusions or nearby crystals may be schorl, but visual confirmation is needed.
Field identification & locations
Look for a hexagonal prism and glassy luster, and test hardness only on an inconspicuous area; similar-looking minerals can be mistaken for beryl. Pegmatites worldwide produce beryl, including notable deposits in Brazil, Madagascar, and Pakistan.
