mineral
Small tumbled quartz-like pebble
Likely quartz (SiO₂), possibly milky quartz or pale chalcedony
AI-generated identification · may be incorrectCream-white, translucent, rounded/cut fragment with a glassy to waxy luster; likely Mohs hardness 7, no obvious cleavage, conchoidal fracture, and specific gravity about 2.65. The image is insufficient to confirm crystal structure or distinguish quartz from calcite/feldspar.
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Physical properties
Cream-white, translucent, rounded/cut fragment with a glassy to waxy luster; likely Mohs hardness 7, no obvious cleavage, conchoidal fracture, and specific gravity about 2.65. The image is insufficient to confirm crystal structure or distinguish quartz from calcite/feldspar.
Formation & geological history
Most likely weathered quartz derived from igneous or metamorphic rocks and transported in sediment; quartz formed over a wide geological age range. Around 18.8°N, 95.8°W, quartz-rich alluvial and volcanic-derived material is plausible.
Uses & applications
Common quartz is used in glass, ceramics, abrasives, electronics, and construction aggregate; attractive pieces are sold as inexpensive specimens or lapidary material.
Geological facts
Quartz commonly survives weathering because it is hard and chemically resistant. A steel file or glass-scratch test can help: quartz should scratch ordinary glass, while calcite will not.
Field identification & locations
Likely identification is low-to-moderate confidence from the small image. Confirm with hardness, streak (white), and acid testing: calcite fizzes strongly in dilute hydrochloric acid, whereas quartz does not.
