Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Sandstone

Arenite

Biotite-bearing granite or granodiorite

Coarse-grained felsic intrusive rock; primarily quartz (SiO₂), feldspar, and biotite mica, possibly with hornblende

Sandstone

Arenite (primarily SiO2)

Weathered fine-grained stone, likely sandstone or quartzite

Quartz-rich sandstone (possibly weakly metamorphosed quartzite); predominantly SiO₂

Greywacke (River Pebble)

Dirty Sandstone (SiO2 with lithic fragments)

White quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly micaceous or feldspathic

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Sandstone

Arenite (SiO2 based)

Gravel and Pebbles

Unconsolidated rock fragments (clastic sediment)

Quartzite (River Pebble)

Metamorphic rock consisting primarily of Quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Gravel/Common Siltstone

Siltstone (fine-grained siliciclastic sedimentary rock)

Sandstone

Arenite (SiO2 primarily)

Pink granite (likely weathered)

Granite; predominantly quartz, potassium feldspar, plagioclase, and mica

Rounded yellow-brown cobble

Likely weathered sandstone or quartz-rich conglomeratic clast; exact identification requires a fresh surface and testing

Sandstone

Arenite (SiO2 composition primarily)

Sandstone

Sandstone (clastic sedimentary rock composite)

Mixed collection of natural stones

Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks

Quartz-rich sandstone or quartzite fragment

Likely quartz arenite; possibly weakly metamorphosed quartzite (mostly SiO₂)

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Quartz Breccia with Iron Staining

Tectonic or Sedimentary Breccia (SiO2 with Fe2O3)

Pink-and-black banded granite (possibly orbicular/flow-banded granite)

Granitic rock composed chiefly of quartz, alkali feldspar, plagioclase, and biotite/hornblende

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (specifically sublithic or quartz arenite)

Sandstone

Arenite (SiO2 based with mineral cement)

Sandstone

Sandstone (SiO2-rich clastic sedimentary rock)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 predominantly)

Sandstone

Sandstone (SiO2 dominant)

Sandstone

Arenite (SiO2 dominant)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 principal composition)

Granite

Plutonic felsic igneous rock

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Red Sandstone Pebble

Arenite (Iron-oxide stained)

Sandstone (likely Quartz Sandstone)

Arenite (SiO2 based)

Sandstone

Arenite (primarily composed of SiO2)

Feldspathic sandstone or arkose

Arkose; chiefly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), and minor lithic grains in a silica/clay cement

Sandstone

Arenite (Siliclastic sedimentary rock)

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (composed primarily of SiO2 with various lithic fragments)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone

Sandstone (SiO2-rich detrital sedimentary rock)

Granite or granitic gneiss pebble

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

Weathered quartz-bearing sandstone

Quartz arenite or feldspathic sandstone (tentative)