Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Igneous Or Sedimentary (Water Worn)
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Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz (Smoky or Clear variety with inclusions)
Silicon Dioxide (SiO2)
mineral
Red Sandstone (Siltstone pebble)
Arenite / Siltstone (Silicon dioxide based with hematite impurities)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Chalcedony (likely carnelian or yellow agate)
Silicon Dioxide (SiO₂)
mineral
River Rock (Gneiss/Schist mix)
Foliated Metamorphic Rock (Gneiss)
metamorphic
Sandstone (Quartz-rich)
Arenite (composed primarily of SiO2)
sedimentary
Chert (Beach Pebble)
Silicon Dioxide (SiO2)
sedimentary
Rough Agate/Chert Nodules
Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper / Quartz Pebble
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Limestone Pebble
Limestone (CaCO3)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper / Quartz Pebble
Silicon dioxide (SiO2) microcrystalline quartz
sedimentary
Quartz (Yellow / Citrine Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Cryptocrystalline Quartz (Agate/Chert)
Silicon dioxide (SiO2)
sedimentary
Polished orbicular stone, likely granite or diorite
Granite–diorite, composed mainly of feldspar, quartz, and dark amphibole/biotite
igneous
Black River Stone (Chert or Basalt Pebble)
Microcrystalline Quartz (SiO2) or Mafic Igneous Rock
sedimentary
Granite
Granite
igneous
Carnelian (Carnelian Agate)
Carnelian (Silicon Dioxide - SiO2)
mineral
Basalt with Chert or Jasper Inclusion
Igneous basalt / sedimentary chert nodule
igneous
River Stone
Water-worn lithic fragment
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz (Agate/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Quartz (River Pebble) and Chert/Jasper
Silicon Dioxide (SiO2)
mineral
White Agate / Chalcedony
Silicon Dioxide (SiO2)
gemstone
Basalt or Siltstone Pebbles
Mafic volcanic rock (Basalt) or Indurated Siltstone
igneous or sedimentary
Chalcedony with inclusions (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Tumbled/Water-worn)
Silicon Dioxide (SiO2)
mineral
River Rock
Silica-rich water-worn rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Banded Jasper and Quartz Pebble
Silicified sedimentary rock / Chalcedony (SiO2)
sedimentary
Rounded gray pebble
Indeterminate; likely a water-worn silicate or carbonate pebble
sedimentary
River Cobble (Gneiss/Schist mix)
Foliated Metamorphic Rock (Gneissic/Schistose)
metamorphic
Quartz-veined Metamorphic Pebble
Silicate-rich metamorphic rock with quartz veins (SiO2)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz Pebble
Crystalline Silica (SiO2)
sedimentary
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)