Quartz (Water-worn Pebbles)

Hardness of 7 on the Mohs scale, vitreous to greasy luster, translucent to transparent, conchoidal fracture, and distinct lack of cleavage. Specific gravity is approximately 2.65.

Formed in a wide variety of geological environments, including igneous, metamorphic, and sedimentary rocks. These particular specimens are water-worn alluvial or beach pebbles shaped by prolonged mechanical weathering and transport in water.

Used in glassmaking, electronics, abrasive materials, ornamental objects, and lapidary arts.

Quartz is one of the most abundant minerals in the Earth's continental crust. While the user suggested 'topaz', these smooth, rounded pebbles lack the perfect basal cleavage and higher specific gravity of topaz, aligning instead with common water-worn quartz or potentially water-worn beryl/topaz given the locality, though visually and physically quartz is the most direct match.

Can be identified in the field by its hardness (scratches glass easily), lack of cleavage, and resistance to chemical and mechanical weathering. Found worldwide in riverbeds, beaches, and sedimentary deposits.