Sedimentary Rock Fragments
Clastic Sedimentary Rock
sedimentary
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Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Orange Quartz (or Carnelian Chalcedony)
Silicon Dioxide (SiO2)
mineral
Basalt (Vesicular or Porphyritic River Pebble)
Mafic Volcanic Rock (Aphanitic to Porphyritic Basalt)
igneous
Granite
Intrusive igneous rock
igneous
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Shale
Shale (clastic sedimentary rock)
Sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Granite with Cupules / Bedrock Mortars
Granite (felsic intrusive plutonic rock)
igneous
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Likely weathered gneiss
Foliated metamorphic rock, commonly quartz–feldspar–mica gneiss
metamorphic
Banded Greywacke
Greywacke (Lithic wacke)
sedimentary
Granite
Plutonic felsic rock (Quartz, Feldspar, Mica)
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite
Intrusive Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Ulexite
NaCaB5O6(OH)6·5H2O
mineral
Quartz Geode
Silicon Dioxide (SiO2) in a sedimentary or volcanic host
mineral
Banded Sandstone Peabble
Arenite with iron oxide banding
sedimentary
River Stone (Sedimentary Sandstone/Quartzite)
Arenite/Quartzite transition specimen
sedimentary
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Vesicular Basalt (or Scoraceous Basalt)
Basalt (Vesicular texture)
igneous
Quartz-veined Metamorphic Rock
Quartz-veined Schist or Gneiss
metamorphic
Slate with Quartz Vein
Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Likely gneiss
Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole
metamorphic
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Granite Cobble
Granite
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Granite (felsic intrusive igneous rock)
igneous
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Banded Sandstone (Beach Pebble)
Quartz Arenite Sandstone
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Gneiss (Pebble)
Gneiss
metamorphic
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Orbicular Jasper (Ocean Jasper)
Silicon Dioxide (SiO2) with various inclusions
mineral
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary