Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Sandstone (with secondary weathering/concretion)

Arenite (composed primarily of Quartz, SiO2)

Black Beach Pebble (Basalt / Slate Pebble)

Rounded Fine-Grained Clastic / Igneous Rock Pebble

Gneiss

Gneiss (Metamorphic Rock)

Quartz Pebble (Water-worn Quartzite)

Silicon Dioxide (SiO2)

Fossiliferous Sandstone / Quartzite Pebble

Sedimentary rock with skeletal fragments (e.g., Paleozoic crinoid/brachiopod fossils)

Sandstone (Garden Boulder)

Sandstone (SiO2 dominated)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Pebble

Clast (specifically a granule or small pebble)

Rounded brown granite-like pebble

Likely weathered granite or granodiorite; exact identification requires a fresh surface and testing

Ferruginous Sandstone (with Pyrite/Gold associations)

Ferruginous Arenite (SiO2 + Fe2O3)

Fossilized Shell in Limestone

Carbonate sedimentary rock with Bivalvia or Brachiopoda remains

Weathered granite or granitic pegmatite cobble

Granite/granitic rock, composed mainly of quartz (SiO₂), feldspar, and minor biotite or other dark minerals; the reddish-brown areas may be iron-oxide staining or weathered accessory minerals

Granite cobble

Granite; coarse-grained quartz–feldspar–mica rock

Jasper Conglomerate (Puddingstone)

Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)

Puddingstone

Polymictic Conglomerate

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered granite or granitic gneiss

Quartz–feldspar–mica granitoid; possibly gneiss if the visible layering is tectonic

Breccia

Breccia (Clastic Sedimentary Rock)

Polished orbicular gabbro (likely “leopard-skin” or larvikite-type material)

Gabbro, a coarse-grained mafic plutonic rock; chiefly plagioclase feldspar and pyroxene, with possible olivine/amphibole and iron oxides

Sandstone

Arenite

Quartz-rich mineral fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Weathered sandstone

Quartz-rich clastic sandstone, likely iron-oxide stained

Iron-rich brown stone, possibly weathered chert or ironstone

Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)

Sandstone

Sandstone (composed predominantly of Quartz, SiO2)

Rounded granitic gneiss or granite cobble

Biotite granite, possibly weakly foliated granitic gneiss; quartz–feldspar–biotite assemblage

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Orbicular rhyolite (orbicular jasper-like volcanic rock)

Orbicular rhyolite; predominantly quartz, alkali feldspar, plagioclase, and volcanic glass, with concentric spherulitic growths

Rounded brown river pebble, likely sandstone or iron-rich quartzite

Probable ferruginous sandstone; possibly quartzite (SiO₂-rich)

Banded sandstone or quartzite fragment

Quartz-rich sandstone; possibly weakly metamorphosed quartzite

Sandstone (with Calcite or Silica veins)

Clastic sedimentary rock (primarily SiO2)

Weathered quartz-rich pebble

Likely quartz aggregate, SiO₂, possibly quartzite or silicified rock

Light-colored granite or granitic gneiss

Granite; primarily quartz (SiO₂), feldspar, and minor mica, possibly with gneissic fabric

Weathered quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with iron-oxide staining

Sandstone (Quartzose)

Arenite (primarily SiO2)

Rounded granitic pebble

Granite, chiefly quartz, feldspar, and mica/amphibole

Likely weathered brown stone, possibly iron-rich sandstone or chert

Indeterminate from image; possible ferruginous sandstone (quartz + iron oxides) or iron-rich chert

Sandstone

Arenite

Quartz-rich granite or granitic pegmatite

Granite; predominantly quartz (SiO₂), feldspar, and possibly mica

Sandstone

Sedimentary Rock (Quartz Sandstone)

Weathered rock fragment, possibly granite or metamorphic stone

Indeterminate; likely quartz–feldspar–mica aggregate (granite-like), but image resolution prevents reliable identification

Sandstone

Arenite

Shale

Fissile Clay-dominant Mudrock (SiO2, Al2O3, K2O, Na2O, CaO, MgO)