Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Gneiss

Gneiss (Foliated Metamorphic Rock)

Quartz

SiO₂ (Silicon Dioxide)

Mixed rock fragments, likely basalt and weathered granite

Probable mafic volcanic rock (basalt) with granitoid fragments; exact identification is uncertain from the image

Quartz-rich pegmatitic rock, possibly rose quartz with mica

Granitic pegmatite; predominantly quartz (SiO₂), with feldspar and mica

Limestone Breccia

Sedimentary Breccia (Calcareous)

Sandstone

Arenite (predominantly SiO2 quartz grains)

Conglomerate

Quartz Conglomerate

Sandstone (with Rock Art)

Sandstone (Clastic Sedimentary Rock)

Likely weathered sandstone or quartzite

Quartz-rich sandstone (SiO₂-dominant); possibly metamorphosed to quartzite

Banded gneiss

Foliated silicate rock, typically quartz–feldspar–mica gneiss

Asphalt Concrete

Bituminous conglomerate

Conglomerate

Polymictic Conglomerate

Conglomerate with Quartzite Pebbles

Clastic sedimentary rock (Conglomerate)

Vein-bearing sandstone or quartzite cobble

Quartz-rich sandstone with white quartz veins; possibly metamorphosed to quartzite

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)

Quartz-rich rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with minor feldspar or mica

Siltstone with Quartz Vein

Siltstone (primarily SiO2, Al2O3, Fe2O3)

Graywacke

Graywacke (immature sandstone)

Sandstone with Lichen and Iron Oxide Staining

Quartz Arenite / Sandstone

Sandstone

Arenite (SiO2 principal)

Concrete rubble

Anthropogenic conglomerate

Foliated mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly garnet-bearing

Fragmented Sedimentary Pebble

Clastic Sedimentary Specimen

Likely coarse-grained igneous rock, possibly granite or gabbro

Granite (quartz–feldspar–mica) or gabbro (plagioclase–pyroxene); exact identification requires a fresh surface and testing

Quartz Pebble

Silicon Dioxide (SiO2)

Likely weathered granite or granitic gneiss

Granite: quartz + feldspar + mica; possibly gneiss if the faint banding is structural

Iron-rich sandstone or weathered laterite fragment

Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂ with iron oxides such as hematite/goethite)

Conglomerate

Clastic Conglomerate (Lithic-rich)

Gneiss (Gneissic Granite Pebble)

Metamorphic rock rich in Quartz, Feldspar, and Mica

Siltstone River Rock

Siltstone (composed of silt-sized particles, silicate minerals)

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Sandstone (Iron-stained)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

White quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite, a metamorphosed quartz sandstone

Breccia

Breccia

Conglomerate

Polymictic clast-supported conglomerate, likely carbonate-rich

Quartzite (with possible Calcite/Limestone weathering)

Quartzite (primarily SiO2)

Conglomerate (pebble conglomerate)

Clastic conglomerate; quartz- and feldspar-rich clasts in a dark, iron-stained matrix

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica, possibly with gneissic foliation

Sandstone

Arenite (SiO2 dominant)

Weathered granite or granitic gneiss pebble

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

Sandstone

Sandstone (clastic sedimentary rock)

Likely weathered sandstone or quartzite

Quartz-rich sandstone; possibly metamorphosed to quartzite (SiO₂-dominant)