mineral
Polished druzy quartz specimen
Quartz (SiO₂), likely druzy quartz with possible blue chalcedony or inclusions
AI-generated identification · may be incorrectHardness 7 Mohs; white to gray crystalline surface with blue-gray areas, vitreous to sugary luster, and no obvious cleavage. The square, dark-edged form appears cut, polished, or mounted rather than naturally shaped.
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Physical properties
Hardness 7 Mohs; white to gray crystalline surface with blue-gray areas, vitreous to sugary luster, and no obvious cleavage. The square, dark-edged form appears cut, polished, or mounted rather than naturally shaped.
Formation & geological history
Quartz formed from silica-rich hydrothermal fluids or cavity-filling deposits, commonly in volcanic or sedimentary environments; the specimen’s geological age cannot be determined from the image. Its shape indicates human processing.
Uses & applications
Used for ornamental objects, décor, lapidary work, and mineral collecting; comparable pieces are usually decorative rather than gem-grade jewelry material.
Geological facts
Druzy is a coating of many tiny quartz crystals that sparkle under light; blue coloration may result from chalcedony, mineral inclusions, or artificial enhancement.
Field identification & locations
Look for a glittering microcrystalline surface, glassy quartz grains, and hardness sufficient to scratch ordinary glass; acid testing is unnecessary. Common sources include Brazil, Uruguay, Mexico, and Morocco, but locality cannot be confirmed visually.
