Basalt (Road Gravel)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Category
Not A Rock
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Diorite
Phaneritic intermediate plutonic rock (Diorite)
igneous
Granite Pebble
Granite (Felsic Intrusive Igneous Rock)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Granite (River Pebble)
Phaneritic intrusive igneous rock (Felsic)
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Kimberlite
Kimberlite (Potassic ultramafic volcanic rock)
igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Fossiliferous Shale or Slate with Plant Fossils
Fossil-bearing argillaceous rock
Sedimentary/Metamorphic
Ocean Jasper
Spherulitic Chalcedony (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Banded Gneiss and Siltstone River Stones
Gneiss (High-grade Metamorphic Rock)
metamorphic
Granite (River Pebble)
Phaneritic Felsic Igneous Rock
igneous
Snowflake Obsidian
Vitreous volcanic rock with Cristobalite inclusions (mostly SiO2)
igneous
Basalt
Basalt (Mafic Extrusive)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineralological
Sandstone
Arenite
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Yellow Jasper
Chalcedony (SiO2 with iron oxide inclusions)
sedimentary
Chert Pebble Map
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Red Jasper with Quartz and Hematite
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Vesicular Basalt
Extrusive Basaltic Scoria (CaAl2Si2O8 / (Mg,Fe)2SiO4)
igneous
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Desert Rose
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O) or Barite (Barium Sulfate, BaSO4)
mineral
Quartz Geodes and Crystal Clusters
Silicon Dioxide (SiO2)
mineral
Scoria
Scoriaceous Basalt
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Red Sandstone)
Arenite (predominantly SiO2 with Fe2O3 cement)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Fossilized Horn Coral
Order Rugosa (Rugose Coral)
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)
sedimentary
Jasper (specifically Bloodstone or Heliotrope variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary (chemically precipitated)
Chert (Smooth River Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper (Brecciated Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (Commonly known as Jasper or Flint)
Microcrystalline silica (SiO2)
sedimentary