igneous/metamorphic

General river rock or weathered cobble

Mixed rock composition

Hard, rounded shape due to water erosion, greenish-gray hue with reddish/brownish spots likely due to iron oxidation.

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Physical properties

Hard, rounded shape due to water erosion, greenish-gray hue with reddish/brownish spots likely due to iron oxidation.

Formed through various geological processes, then weathered and rounded by water transport in a riverbed or shoreline.

Commonly used in landscaping, decorative ground cover, or casual collecting.

River rocks are naturally smoothed over time by the abrasive action of water and other rocks.',

Found universally in riverbeds, streams, and beaches. Identified by its smooth, rounded appearance.

Banded Basalt / Lave Stone or Gneiss Pebble

Igneous/Metamorphic banded pebble

Magnetite (Lodestone variety)

Magnetite (Fe3O4)

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

Magnetite

Magnetite (Fe3O4)

Blue gemstone in a decorative setting (possibly blue spinel or sapphire)

Unidentified blue faceted gemstone; sapphire is corundum (Al₂O₃), while spinel is MgAl₂O₄

Magnetite

Magnetite (Fe3O4)