mineral
Tumbled pale blue-green quartz (likely aquamarine-bearing quartz)
Quartz, SiO₂; blue coloration may reflect inclusions or minor iron-bearing minerals
AI-generated identification · may be incorrectHardness 7 Mohs; translucent pale gray-blue to green, vitreous luster, uneven conchoidal fracture, and no obvious cleavage. The rounded edges indicate tumbling or natural abrasion; exact identification requires hardness and specific-gravity tests.
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Physical properties
Hardness 7 Mohs; translucent pale gray-blue to green, vitreous luster, uneven conchoidal fracture, and no obvious cleavage. The rounded edges indicate tumbling or natural abrasion; exact identification requires hardness and specific-gravity tests.
Formation & geological history
Quartz crystallizes from silica-rich hydrothermal fluids and igneous pegmatites; blue-green varieties commonly occur with beryl, feldspar, and mica in granitic pegmatites, generally formed during Precambrian to younger geologic events.
Uses & applications
Used as a lapidary and ornamental stone, cabochon, and collector specimen. Ordinary quartz has broad industrial uses in glass, ceramics, electronics, and abrasives.
Geological facts
The specimen could also be pale aquamarine, feldspar, or a coated glass-like material; the photograph alone cannot reliably distinguish these. A steel file should not scratch quartz, while quartz should scratch ordinary glass.
Field identification & locations
Common sources include Brazil, Pakistan, Afghanistan, Madagascar, and U.S. pegmatite districts. Confirm with a scratch test, glass comparison, streak (white), and specific gravity; avoid destructive testing if valuable.
