Basalt
Extrusive Igneous Rock
igneous
Category
Man Made (Synthetic Rock)
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Limestone
Calcium Carbonate (CaCO3)
sedimentary
Rose Quartz (likely carved)
Rose Quartz (SiO2)
Mineral
Rose Quartz Carving
Quartum roseum (Variety of Quartz, SiO2)
Mineral
Porphyritic Igneous Pebble / Porphyry
Porphyritic Igneous Rock
igneous
Sandstone (Stream-rounded)
Arenite (SiO2 based)
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Basalt Pebble
Aphanitic Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Granite
Intrusive igneous rock
igneous
Basalt Pebble (Shaped)
Extrusive Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Basalt
Extrusive mafic rock
igneous
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Vesicular Basalt / Scoria pebble
Extrusive igneous rock with amygdaloidal infilling
igneous
Moqui Marble
Hematite-Goethite Concretion
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite with Epidote Vein
Metamorphosed Quartz Sandstone with Hydrothermal Vein
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Vein in Basalt or Sedimentary Host Rock
Silica-veined lithic fragment (SiO2 in host matrix)
sedimentary
Fossilized Coral (Rugose or Tabulate) or Stromatolite
Phylum Cnidaria / Stromatolithus
fossil
River Pebble
Polished Quartzite / Siliceous River Pebble
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Apache Tear
Obsidian (Volcanic Glass)
igneous
Agated Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz pebble (Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz fragment (Pebble)
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (plutonic felsic rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert Pebble (with Quartz Vein)
Silicon Dioxide (SiO2)
sedimentary
Beach Agate / Jasper Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Pebble with Drusy/Crystalline Pocket
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion (Moqui Marble / Boji Stone)
Sedimentary Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 with various cementing minerals)
sedimentary