mineral
White quartz-rich pebble, possibly milky quartz
Milky quartz (SiO₂), with possible feldspar or calcite inclusions
AI-generated identification · may be incorrectTypically Mohs hardness 7, white to translucent, vitreous to waxy luster, and no obvious cleavage; the rounded shape indicates water or human tumbling. Exact identification is uncertain from the image alone, as calcite or marble can appear similar.
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Physical properties
Typically Mohs hardness 7, white to translucent, vitreous to waxy luster, and no obvious cleavage; the rounded shape indicates water or human tumbling. Exact identification is uncertain from the image alone, as calcite or marble can appear similar.
Formation & geological history
Milky quartz forms when microscopic fluid inclusions cloud quartz in igneous, metamorphic, or hydrothermal veins; such pebbles commonly derive from eroded quartz veins and may be geologically millions to billions of years old.
Uses & applications
Common pieces are used as decorative stone, landscaping material, lapidary blanks, and inexpensive jewelry; quartz is also important industrially in glass, ceramics, electronics, and silicon production.
Geological facts
Quartz commonly shows conchoidal fracture rather than cleavage and scratches glass. A steel file generally will not scratch it, while calcite is much softer and reacts with dilute acid.
Field identification & locations
Look for glassy luster, translucency at thin edges, and lack of acid reaction; test inconspicuously with a steel point and glass, avoiding valuable specimens. Quartz pebbles occur worldwide in stream gravels and vein outcrops.
