Sandstone (Iron-stained)
Clastic sedimentary rock (SiO2 with Fe2O3 staining)
sedimentary
Category
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Tumbled River Pebble (Quartzite / Agate)
Silicon Dioxide (SiO2)
sedimentary
Vesicular Limestone with Borings
Fossiliferous Calcarenite (Calcium Carbonate, CaCO3)
sedimentary
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Yellow Jasper (Chert) Pebble
Silicon Dioxide (SiO2) with Iron Oxides
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Limestone with Lichen
Calcium Carbonate (CaCO3) with Endolithic/Epilithic Lichen
sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Tumbled Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Vesicular Basalt (Lava Rock)
Vesicular basalt
igneous
Shale
Shale (Fissile Mudstone)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Red Sandstone
Arenite (predominantly Quartz with Hematite cementation)
sedimentary
River Pebble / Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Sandstone (likely Quartzose type)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Quartz-veined Diabase or Basalt Pebble
Diabase or Basalt with Hydrothermal Quartz Veins (SiO2)
igneous
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Basalt River Stone
Basalt
igneous
Rounded granite cobble
Granite; chiefly quartz, feldspar, and mica/amphibole
igneous
Pink Dyed Agate
Silicon Dioxide (SiO2) - Variety Agate
mineral
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Scoria
Vesicular Mafic Igneous Rock
igneous
Smoky Quartz
Smoky Quartz (SiO2: Silicon Dioxide)
mineral
Sandstone
Arenite (major component SiO2)
sedimentary
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Granite
Intrusive igneous rock (Acidic)
igneous
Blue Topaz
Aluminum Silicate Fluoride Hydroxide - Al2SiO4(F,OH)2
gemstone
River Rock (Basalt or Sandstone)
Clastic Sedimentary Rock or Extrusive Mafic Igneous Rock
igneous or sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone Pebble
Sandstone (Silicon dioxide-rich clastic sedimentary rock)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Sandstone (Stream-rounded)
Arenite (SiO2 based)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Gravel (Crushed Stone Aggregates)
Mixed Siliciclastic / Carbonate Aggregate
sedimentary
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary