Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Likely weathered sandstone or iron-stained quartzite fragment

Quartz-rich sandstone (predominantly SiO₂; exact identification uncertain from image)

Tumbled sandstone or iron-stained quartzite pebble

Quartz-rich sandstone (SiO₂), possibly weakly metamorphosed quartzite

Weathered granite or granitic gneiss

Granite: quartz, feldspar, and mica; possibly weakly foliated gneiss

Rounded granitic gneiss or granite cobble

Quartz–feldspar–mica granitoid; possibly weathered gneiss

Quartz Pebble

Silicon Dioxide (SiO2)

Granitic Pegmatite Intrusion in Host Rock

Pegmatite dike in amphibolite or schist

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Ferruginous)

Sandstone (mainly SiO2 with Fe2O3 staining)

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃), with fossil shell fragments

Sandstone

Sedimentary Rock (Quartz Sandstone)

Sandstone (likely Calcareous or Micaceous)

Clastic sedimentary rock (primarily Quartz with Cementing Agents)

Sandstone (Lithic Sandstone / Greywacke)

Sandstone (SiO2 rich clastic sedimentary rock)

Sandstone

Sandstone (composed mainly of Quartz, SiO2, and Feldspar)

Light-colored limestone (probable fossiliferous or micritic limestone)

Calcite-rich carbonate rock; predominantly CaCO₃ (calcite)

Sandstone

Arenite (clastic sedimentary rock)

Sandstone (lithic wacke/arenite)

Clastic sedimentary rock (SiO2 + varied clasts)

Pegmatitic granite, possibly potassium-feldspar-rich

Coarse-grained granite; mainly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), plagioclase, and biotite/hornblende

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 primarily)

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Quartzite (iron-stained, possibly metaconglomeratic)

Quartzite; predominantly recrystallized quartz (SiO₂) with iron-oxide accessory minerals

Weathered granite or granitic pegmatite

Coarse-grained quartz–feldspar–mica rock; likely granite, possibly pegmatitic granite

Sandstone

Arenite

Sandstone

Arenite (SiO2 based)

Siltstone / Slate

Siltstone / Low-grade Slate

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 primarily)

Weathered iron-rich rock, possibly laterite or limonite-bearing sandstone

Laterite/limonite-rich material; commonly dominated by goethite (FeO(OH)) and hydrated iron oxides

Sandstone

Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)

Sandstone

Arenite (SiO2 based clastic rock)

Sandstone

Arenite (Silicon Dioxide with various mineral cements)

Sandstone

Sandstone (SiO2 dominated clastic sedimentary rock)

Dark river pebble (likely basalt or andesite)

Fine-grained mafic/intermediate volcanic rock; commonly basalt (plagioclase ± pyroxene/olivine)

Sandstone (Siltstone or Fine-grained)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar, mica, and iron-oxide impurities

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (likely a river or beach pebble)

Sandstone (a clastic sedimentary rock)

Sandstone

Arenite (primarily SiO2)