Sandstone (Quartz-rich)
Arenite (SiO2 based clastic rock)
sedimentary
Category
Man Made
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Sandstone (Ferruginous)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Crazy Lace Agate
Chalcedony (SiO2 with inclusions)
sedimentary
White Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Gold Nugget
Native Gold (Au)
mineral
Eye Agate
Silicon Dioxide (SiO2) with impurities
mineral
Granite
Granite
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Agate (Botswana Agate)
Silicon Dioxide (SiO2)
mineral
Green Jasper
Jasper (Silicates, SiO2)
sedimentary
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with various inclusions
sedimentary (geologically classified as a variety of chalcedony/quartz)
Rose Quartz (Dyed)
Silicon Dioxide (SiO2) with trace impurities
mineral
River Quartzite (Water-worn Quartzite)
Quartzite (primarily SiO2)
metamorphic
Basalt (Weathered)
Extrusive mafic volcanic rock
igneous
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with various inclusions
mineral
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz (Granular Milky Quartz fragment)
Silicon Dioxide (SiO2)
mineral
Banded Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Limestone
Calcareous Sedimentary Rock (CaCO3)
sedimentary
Red Jasper
Silicon dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Smoky Quartz Geode Cluster
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone
Clastic sedimentary rock (primarily Quartz with Iron Oxide cement)
sedimentary
Jasper (specifically Yellow and Red Jasper/Chert)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Peacock Ore (Chalcopyrite)
Chalcopyrite (CuFeS2)
mineral
Red Sandstone
Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone (Fossiliferous)
Calcium Carbonate (CaCO3)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Shiva Lingam
Cryptocrystalline Quartz (Jasproid/Chalcedony mix)
sedimentary
Soapstone
Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)
Metamorphic Rock
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt (Water-worn pebble)
Mafic Igneous Rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Vesicular Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Shiva Lingam (Sandstone Pebble)
Ferruginous Sandstone (SiO2 with Fe-oxides)
sedimentary
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)
Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)
Metamorphic
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous