Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Conglomerate

Clastic sedimentary rock (composed mostly of SiO2)

Grey River Pebble (Greywacke / Basalt)

Stream-rounded silicate rock pebble

Sandstone

Clastic sedimentary rock (Quartz arenite or arkose)

Sandstone (with possibly iron oxides and other minerals)

Sandstone

Puddingstone (Conglomerate)

Conglomerate (clastic sedimentary rock)

Weathered sandstone or iron-stained quartzite

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

Puddingstone

Conglomerate (Indurated)

Quartzite in Conglomerate

Clastic Sedimentary Rock with Silicon Dioxide (SiO2) inclusions

Concrete or artificial stone core sample

Artificial conglomerate

Quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly crystalline SiO₂), possibly quartz-rich schist or vein quartz

Conglomerate

Conglomerate (Sedimentary Rock)

Conglomerate

Clastic sedimentary rock (Psephite)

Chert Breccia

Brecciated Chert

Purple Conglomerate

Polymictic Conglomerate

Breccia

Breccia (Sedimentary Clastic Rock)

Conglomerate (Greenstone/Pebble Conglomerate)

Polymictic Conglomerate

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz, SiO2)

Conglomerate

Conglomerate (Sedimentary rock)

Coarse-grained Jasper or Jasper Conglomerate

Silicon Dioxide with Iron Oxide (SiO2) + Fe2O3

Sedimentary Sandstone

Arenite (Sedimentary Rock)

Quartzite Conglomerate

Conglomerate (SiO2 rich)

Conglomerate

Polymictic Conglomerate

Quartzite

Quartzite (primarily SiO2)

Coarse-grained granite, possibly granodiorite

Granite–granodiorite; chiefly quartz, alkali feldspar, plagioclase, and mica

Weathered sandstone

Quartz-rich sandstone, locally iron-oxide stained (SiO₂-dominant)

Pink feldspar-rich granite or pegmatite

Potassium-feldspar granite; chiefly microcline/orthoclase (KAlSi₃O₈), quartz, and minor mica

Quartz Conglomerate

Quartz Conglomerate (clastic sedimentary rock)

Sandstone

Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)

Breccia Pebble

Sedimentary Breccia

Granite fragment

Granite; chiefly quartz, alkali feldspar, and plagioclase, with minor mica or amphibole

Arkosic Sandstone (or Conglomeritic Sandstone fragment)

Arkose (rich in feldspar)

Weathered quartz-rich rock, possibly sandstone or quartzite

Indeterminate; likely quartz sandstone (SiO₂-rich), possibly weakly metamorphosed quartzite

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

Conglomerate / Breccia Matrix (Aggregated Rock)

Sedimentary Breccia / Conglomerate

Granite retaining-wall blocks

Granite, principally quartz, potassium feldspar, plagioclase, and mica

Sandstone (likely Graywacke or Lithic Arenite)

Clastic sedimentary rock predominantly composed of silicate grains

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine

Sandstone (Common Quartz Pebble/Rock)

Sedimentary rock / Quartz arenite

Conglomerate (or Breccia)

Clastic Sedimentary Rock

Puddingstone (Quartzite Pebble)

Metaconglomerate / Jasper-Quartzite Pebble

Brecciated polymictic rock, possibly impact breccia

Polymictic breccia; exact lithology indeterminate from image

Rounded brown river pebble

Indeterminate lithic fragment; possibly weathered sandstone, mudstone, or basalt