Sandstone
Arenite (predominantly SiO2)
sedimentary
Category
Not A Natural Rock
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Sandstone
Arenite (SiO2 based)
sedimentary
Riverstone (likely Graywacke or Siltstone)
Sedimentary sandstone (Graywacke), SiO2 dominant
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Shale or Siltstone
Fine-grained siliciclastic sedimentary rock
sedimentary
Sandstone (Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Travertine / Tufa
Calcium Carbonate (CaCO3)
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Sandstone (Iron-stained Pebble)
Sandstone (Quartz/Hematite dominated)
sedimentary
Limonite (Yellow Ochre)
FeO(OH)·nH2O (Hydrous iron(III) oxide-hydroxide mixture)
Mineral (Iron Ore)
Chert / Flint Nodule
Cryptocrystalline quartz (SiO2)
sedimentary
Rounded tan pebble
Unidentified fine-grained rock; the image does not show enough detail for a reliable species-level identification.
sedimentary
Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Pumice
Pumice (volcanic glass)
igneous
Waterworn pebble, possibly iron-rich basalt or river stone
Unidentified lithic clast; composition cannot be determined reliably from the image
igneous
Possible dark-green tumbled stone
Unidentified; possibly serpentine or green jasper
mineral
Painted pebble, likely granite or granitic gneiss
Granite (quartz–feldspar–mica rock); exact identification is uncertain from the image
igneous
Limonite
Hydrous ferric oxides (FeO(OH)·nH2O)
sedimentary
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, FeO(OH)·nH2O)
mineral
Jasper and Quartz Breccia
Silicon dioxide with iron oxide inclusions (SiO2)
sedimentary
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Titanium Coated Agate Geode
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Seashell Fossil
Invertebrate Bivalve / Gastropod Fossil (Calcium Carbonate, CaCO3)
fossil
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Shale
Shale (clastic sedimentary rock composed of silt and clay-sized particles)
sedimentary
Ulexite
NaCaB5O6(OH)6·5H2O
mineral
Quartz (Milky Quartz / Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Clastic sedimentary rock
sedimentary
Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
River Pebble (Siltstone / Fine-grained Sandstone)
Sedimentary Pebble (Siliclastic)
sedimentary
Rounded river pebble, likely fine-grained volcanic rock
Indeterminate from the image; possibly andesite or basalt
igneous
Goldstone (blue-goldstone–style glass) beads
Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral
mineral
Rough Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Shale
Laminated Mudstone
sedimentary
Sandstone
Arenite (Silicon Dioxide, SiO2 based)
sedimentary
Boulder Opal
Hydrated amorphous silica (SiO2·nH2O) with ironstone matrix
gemstone
Heart-shaped Quartz
Silicon Dioxide (SiO2)
mineral
Picture Jasper
Silicon dioxide with iron oxide impurities (SiO2)
sedimentary
Small water-worn pebble, likely quartz-rich stone
Unidentified quartz-rich lithic pebble; precise identification is not possible from the image
igneous