Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Weathered quartz-rich pebble, possibly sandstone

Indeterminate quartz-rich clastic rock; likely ferruginous sandstone or weathered quartzite

Reddish-brown weathered rock (specific type uncertain)

Possibly iron-oxide-stained sandstone or siltstone; image alone is insufficient for a firm identification

Weathered quartz-rich rock, possibly quartzite or silicified breccia

Quartzite (predominantly SiO₂); exact identification requires a fresh surface and tests

Quartz on Sandstone

Silicon Dioxide (SiO2) in Lithic Sandstone

Tumbled quartz-rich rock, possibly calcite or sandstone

Indeterminate from photograph; likely microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Iron-rich sandstone or ferruginous quartzite

Quartz-rich sandstone cemented by iron oxides; possibly weakly metamorphosed quartzite

Conglomerate

Polymictic clast-supported conglomerate, likely carbonate-rich

Conglomerate (pebble conglomerate)

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

Rounded black-and-cream granite pebble

Granite, composed chiefly of quartz, feldspar, and dark mica or amphibole

Iron-rich sandstone or laterite fragment

Ferruginous sandstone; possibly laterite/goethite-rich ironstone

Sandstone or Siltstone

Arenite (if sandstone)

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

Goethite–hematite/limonite mixture; exact identification requires testing

Sandstone (with Rock Art)

Sandstone (Clastic Sedimentary Rock)

Granite (possibly granitic gneiss)

Felsic plutonic rock dominated by quartz, K-feldspar, plagioclase, biotite and/or hornblende

Rounded quartz-rich pebble, likely sandstone or quartzite

Quartz sandstone (quartz arenite) or low-grade quartzite; predominantly SiO₂

Sandstone (Ferruginous)

Clastic Sedimentary Rock (Litharenite)

Weathered sandstone or iron-rich sedimentary rock

Sandstone, likely quartz-rich with iron-oxide staining

Polished black-and-white feldspathic stone, likely larvikite or gabbro

Larvikite (plagioclase feldspar–augite–nepheline assemblage), possibly coarse gabbro

Concrete rubble

Anthropogenic conglomerate

Weathered quartz-rich cobble (probable sandstone or quartzite)

Indeterminate; likely quartz arenite sandstone, possibly weakly metamorphosed quartzite

Pink-and-black feldspar-rich metamorphic rock, likely gneiss

Biotite–feldspar gneiss, possibly pegmatitic granite-derived

Breccia

Breccia

Sandstone Concretion

Carbonate-cemented Sandstone Concretion

Gabbroic rock, possibly hornblende gabbro

Gabbro; coarse-grained mafic silicate rock dominated by plagioclase and pyroxene, with possible hornblende and magnetite

Rounded river pebble, likely weathered sandstone or iron-rich sedimentary rock

Indeterminate siliciclastic sediment; possibly ferruginous quartz sandstone

Quartz Pebble

Silicon Dioxide (SiO2)

Likely pink granite or granitic gneiss pebble

Granite: quartz + alkali feldspar + plagioclase + biotite/hornblende; possibly weathered gneiss

Pebble / Gravel

Clastic Sedimentary Specimen (likely Limestone or Quartzite base)

Weathered quartz-rich rock, possibly sandstone or quartzite

Likely quartzite (mostly SiO₂), though a granular sandstone is also possible

Small weathered stone, possibly quartz-rich sandstone

Indeterminate siliciclastic rock; likely quartz-bearing sandstone or chert fragment

Conglomerate

Clastic Conglomerate (Lithic-rich)

Puddingstone (Gowganda Conglomerate)

Polymictic Conglomerate (SiO2 matrix with jasper and quartz inclusions)

Weathered quartz-rich rock, possibly quartzite

Quartzite (mostly SiO₂), though the photograph is insufficient for confident identification

Sandstone

Arenite (SiO2 based)

Mica-rich rock spheres (possibly pegmatitic mica nodules)

Mica-rich granitic/pegmatitic material; exact identification is uncertain from the photograph

Sandstone

Sandstone (Quartzose/Feldspathic Sandstone)

Porous limestone or calcareous sandstone

Calcite-rich carbonate rock; chiefly CaCO₃, possibly with quartz and clay

Weathered, biotite-bearing granite or granitic gneiss

Quartz–feldspar–biotite rock; likely granite (compositionally, quartz + K-feldspar/plagioclase + biotite), possibly weakly foliated gneiss

Fossiliferous Limestone or Shale

Biomicrite (if limestone) or Fossiliferous Shale

Weathered gray stone fragment

Undetermined; possibly limestone or sandstone