Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Category
Not A Rock
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River Stone (Chalcedony/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartzite Pebbler
Quartzite (SiO2)
metamorphic
Breccia
Clastic Breccia (SiO2/CaCO3 dominated)
sedimentary
River Cobble (Quartzite)
Meta-orthoquartzite
metamorphic
Jasper (likely Brecciated or Multi-colored)
Jasper (SiO2)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Sandstone (Quartzose)
Arenite (Siliciclastic sedimentary rock)
sedimentary
Hag Stone (Banded Chert or Limestone with Borehole)
Microcrystalline Quartz (Chert) or Calciferous Siltstone (CaCO3/SiO2)
sedimentary
Jasper
Jasper (Cryptocrystalline Quartz; SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (with concrete/human-made layer)
Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)
sedimentary
Pink Granite (River Pebble)
Phaneritic Felsic Igneous Rock
igneous
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Sedimentary
Banded Gneiss with Quartz Vein
Gneiss containing SiO2 (Quartz) intrusion
metamorphic
Sandstone
Arenite
sedimentary
Sandstone with Lichen
Arenite (SiO2 based) with biological weathering
sedimentary
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Arkose/Quartzose)
Arenite (SiO2 based clastic rock)
sedimentary
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Fossiliferous Limestone
Limestone (composed primarily of calcite with included fossils CaCO3)
Sedimentary
Basalt (Vesicular or Scoriaceous)
Aphanitic Mafic Volcanic Rock
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock type)
sedimentary
Quartz in Basalt (Xenocryst)
Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock
Igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Calcite on Matrix
Calcium Carbonate (CaCO3)
mineral
Tiger's Eye
Silicon Dioxide with Crocidolite (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Ruby in Zoisite
Anyolite (Calcium Aluminum Silicate with Aluminum Oxide impurities)
metamorphic
Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Felsic Intrusive Igneous Rock
igneous
Conglomerate (or Breccia)
Clastic Sedimentary Rock (Conglomeratic)
sedimentary
Limestone
Sedimentary Calcite (CaCO3)
sedimentary
Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Raw Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary