Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Weathered granite fragment

Granite, chiefly quartz, feldspar, and mica

Sandstone (with Calcite or Silica veins)

Clastic sedimentary rock (primarily SiO2)

Likely tumbled sandstone or limestone

Quartz-rich sandstone (possibly calcarenite/limestone)

Rounded gray river cobble

Likely fine-grained sandstone, siltstone, or metamorphosed equivalent; exact identification requires a fresh surface and tests

Tumbled quartz-rich rock, likely granite or granitic gneiss

Granite/granitic gneiss; chiefly quartz (SiO₂), feldspars, and minor mica/amphibole

Sandstone

Arenite (SiO2 dominant)

Tumbled brown mineral pebble, possibly jasper or weathered quartzite

Indeterminate from the blurred image; likely microcrystalline quartz (SiO₂) if jasper, or quartzite dominated by quartz

Sandstone

Sandstone (SiO2-rich detrital sedimentary rock)

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite (recrystallized quartz sandstone)

Granite (likely weathered granitic rock)

Granite; predominantly quartz, K-feldspar, plagioclase, and mica

Dark gneiss or migmatitic amphibolite

Band ed gneiss; composition likely quartz–feldspar–biotite/amphibole, possibly migmatite

Sandstone (Quartzose)

Arenite (primarily SiO2)

Weathered sandstone or iron-rich sedimentary cobble

Quartz-rich sandstone, possibly ferruginous sandstone

Orbicular rhyolite (orbicular jasper-like volcanic rock)

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

Weathered conglomeratic river cobble

Polymictic conglomerate or breccia, likely matrix-supported

Sandstone Grain

Clastic Sedimentary Rock Grain (SiO2 dominated)

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)

Sandstone

Sandstone (SiO2-rich clastic sedimentary rock)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Unidentified dark, foliated metamorphic rock

Likely biotite schist or hornblende-bearing gneiss; exact identification requires testing

Weathered sandstone pebble

Quartz-rich sandstone, likely dominated by quartz (SiO₂) with minor clay and iron-oxide staining

Brown beach pebble with iron-rich inclusion

Likely fine-grained sandstone or siltstone; inclusion possibly weathered ironstone/volcanic rock

Iron-stained quartzite (likely)

Quartz-rich quartzite, predominantly SiO₂, with iron-oxide staining

Likely quartz-rich rock fragment

Probably microcrystalline quartz (SiO₂), possibly a pale chert or quartzite fragment

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Granite or granitic gneiss

Quartz–feldspar–mica aggregate; possibly banded orthogneiss

Sandstone

Arenite (primarily composed of SiO2)

Sandstone

Arenite (primarily SiO2)

Tumbled quartz-rich stone, possibly quartzite

Quartzite (mostly SiO₂), visually similar to chert or weathered quartz sandstone

Polished reddish-brown granite or granitic gneiss slab

Granite, chiefly quartz, feldspar, and mica; possibly foliated as gneiss

Sandstone

Arenite (primarily SiO2)

Rounded river pebble, likely quartz-rich sandstone or quartzite

Indeterminate; probable quartz (SiO₂) with feldspar, iron-oxide staining, and minor lithic grains

Sandstone

Sandstone (clastic sedimentary rock)

Small gray, fine-grained pebble (possibly a weathered sandstone or siltstone)

Unidentified lithic pebble; composition cannot be determined from the image

Weathered limestone or calcareous sandstone

Calcite-dominated carbonate rock (CaCO₃), possibly fossiliferous limestone

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with mica or feldspar

Quartz pebble

Silicon dioxide (SiO2)

Sandstone

Arenite

Sandstone

Arenite (primarily SiO2)

Sandstone

Sandstone (SiO2 dominant)

Coarse-grained metamorphic rock, likely amphibolite or hornblende gneiss

Amphibolite; predominantly hornblende amphibole and plagioclase feldspar, possibly with quartz and biotite

Gneiss (likely biotite–quartz–feldspar gneiss)

Foliated gneiss; chiefly quartz (SiO₂), feldspar, biotite, and possibly amphibole