Granite
Felsic intrusive igneous rock
igneous
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Banded Greywacke
Greywacke (Lithic wacke)
sedimentary
Granite
Plutonic felsic rock (Quartz, Feldspar, Mica)
igneous
Vesicular Basalt (or Scoraceous Basalt)
Basalt (Vesicular texture)
igneous
Agated Chert
Microcrystalline Quartz (SiO2)
sedimentary
Biotite Mica Schist
Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2
metamorphic
Basalt (Vesicular or Porphyritic River Pebble)
Mafic Volcanic Rock (Aphanitic to Porphyritic Basalt)
igneous
Shale
Shale (clastic sedimentary rock)
Sedimentary
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Granite with Cupules / Bedrock Mortars
Granite (felsic intrusive plutonic rock)
igneous
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Slate with Quartz Vein
Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)
metamorphic
Gravel and Pebbles
Unconsolidated rock fragments / detrital sediment
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite/Arkose)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite
Intrusive igneous rock
igneous
Sandstone Cobble with Iron Staining
Arenite with Limonite/Hematite staining
sedimentary
Gneiss (Pebble)
Gneiss
metamorphic
Granite
Phaneritic intrusive igneous rock
igneous
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Ulexite
NaCaB5O6(OH)6·5H2O
mineral
River Stone (Sedimentary Sandstone/Quartzite)
Arenite/Quartzite transition specimen
sedimentary
Banded Sandstone Peabble
Arenite with iron oxide banding
sedimentary
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Quartz Geode
Silicon Dioxide (SiO2) in a sedimentary or volcanic host
mineral
Banded Sandstone (Beach Pebble)
Quartz Arenite Sandstone
sedimentary
Copper Ore (Malachite and Azurite on Host Rock)
Cuprite, Malachite, and Azurite dissemination in gangue
mineral
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Orbicular Jasper (Ocean Jasper)
Silicon Dioxide (SiO2) with various inclusions
mineral
Quartz (Smoky/Granular variety)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary