mineral
Drusy quartz cluster (likely quartz on a pale host rock)
Quartz, silicon dioxide (SiO₂), likely microcrystalline/drusy quartz
AI-generated identification · may be incorrectHardness 7 Mohs; translucent honey-gold to clear crystals with vitreous luster, uneven granular texture, and indistinct cleavage. The white outer material may be quartz, calcite, or another host mineral; color could reflect iron staining or surface coating.
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Physical properties
Hardness 7 Mohs; translucent honey-gold to clear crystals with vitreous luster, uneven granular texture, and indistinct cleavage. The white outer material may be quartz, calcite, or another host mineral; color could reflect iron staining or surface coating.
Formation & geological history
Quartz precipitated from silica-rich hydrothermal or cavity fluids, forming a crust of tiny crystals on preexisting rock; exact age and locality cannot be determined from the photograph.
Uses & applications
Used as a decorative specimen, lapidary material, and occasional jewelry component; drusy quartz is valued for its sparkling crystal surface.
Geological facts
The golden coloration is not diagnostic and may result from iron oxides, inclusions, or dye/coating. A glassy sparkle and scratch resistance help distinguish quartz from softer calcite.
Field identification & locations
Common in geodes and mineralized cavities worldwide, especially Brazil, Mexico, Uruguay, Morocco, and the United States. Test cautiously: quartz can scratch glass, while calcite cannot and fizzes in dilute acid.
