igneous, sedimentary, metamorphic

Assorted Beach Rocks and Pebbles

Various (Granite, Basalt, Quartz, Conglomerate, etc.)

Various shapes, sizes, colors, and textures, mostly rounded from water action. Hardness varies by rock type.

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Physical properties

Various shapes, sizes, colors, and textures, mostly rounded from water action. Hardness varies by rock type.

Formed through various geological processes, then weathered and transported by water, resulting in rounded shapes.

Commonly collected for landscaping, decorative purposes, or tumbling by rockhounds.

Beach or river rocks are naturally polished by the action of water and sand over time.

Commonly found on beaches, riverbeds, and glacial deposits. Identify by location and rounded shape. Individual types require specific tests.

Petrified wood

Silicified wood; commonly quartz/chalcedony (SiO₂) replacing organic tissue

Quartz

SiO2 (Silicon dioxide)

Quartz

Silicon Dioxide (SiO2)

Unidentifiable Specimen

Undetermined

Quartz

Quartz (SiO₂)

Mixed mineral and rock specimen collection

Mixed assemblage, visibly including quartz, chalcedony/agate, feldspar, mica, dark mafic rocks, and possibly calcite or gypsum