Rock (Likely Sedimentary)

Polished brecciated jasper

Jasper (microcrystalline quartz, SiO₂), likely brecciated and iron-stained

Rounded gray metamorphic cobble, likely quartzite or gneiss

Quartz-rich metamorphic rock; possibly quartzite (mostly SiO₂) or banded gneiss

Basalt with Epidote (Porphyry)

Basalt (with inclusions of Epidote/Feldspar)

Granite

Granite (High-silica plutonic rock)

Basalt (Vesicular)

Basalt (Extrusive Volcanic Rock)

Weathered iron-rich sandstone or lateritic rock

Quartz-rich sandstone with iron-oxide/hydroxide cement; possible goethite-bearing laterite

Vesicular Basalt

Extrusive Basaltic Scoria (CaAl2Si2O8 / (Mg,Fe)2SiO4)

Gneiss (specifically a Banded Gneiss pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Metallic sulfide ore, likely pyrite-bearing rock

Pyrite (FeS₂), possibly with marcasite or other sulfides

Granite Glacial Erratic

Intrusive Phaneritic Felsic Rock (Granite)

Quartz-rich pegmatitic rock (likely quartz–feldspar–mica specimen)

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and dark mica/amphibole

Greenstone / Quartzite Pebble

Metamorphosed Quartz-rich Rock

Quartz Vein in Matrix / Quartzite

Silicon Dioxide (SiO2) with host rock

Quartz vein in dark host rock

Quartz (SiO₂), likely in basalt, gabbro, or altered mafic rock

Iron-stained quartz-rich rock, likely quartzite or silicified breccia

Quartz (SiO₂), possibly quartzite with limonite/goethite iron oxides

Quartz (in a rock matrix)

Quartz (SiO2)

Weathered granite or granitic gneiss

Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded

Milky quartz-rich rock

Quartz (SiO₂), likely massive milky quartz with minor iron-stained gangue

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), with possible mica or iron-oxide impurities

Quartzite (River Cobble)

Metamorphic Quartz-rich Rock

Clear Quartz (Rock Crystal Fragments)

Silicon Dioxide (SiO2)

Vesicular volcanic rock, likely weathered pumice or scoria

Pumice/scoria; predominantly volcanic glass and feldspar, with possible iron oxides

Dark mafic rock, likely basalt

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Iron-stained limestone or coral fragment

Calcite-rich carbonate rock; chiefly CaCO₃ (exact identification is uncertain from the image)

Tumbled-looking granite pebble

Granite, chiefly quartz–feldspar with biotite/amphibole

Calcite (or Alabaster, if truly carved)

Calcium Carbonate (CaCO3)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with mica or iron-oxide impurities

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), with minor feldspar, mica, and iron-oxide staining

Vesicular basalt (possible scoria)

Basaltic volcanic rock; chiefly plagioclase, pyroxene, and iron-rich minerals, with vesicles formed by trapped gas

Quartz Vein in Matrix

Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix

Quartzite Pebble (with Iron Inclusions)

Metamorphic Rock (Mainly SiO2)

Schist (likely Mica Schist)

Mica Schist

Jasper

Silicon dioxide (SiO2)

Granite

Phaneritic plutonic rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Weathered granite or granitic gneiss fragment

Granite, predominantly quartz, feldspar, and dark mica/amphibole

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica (exact identification uncertain from the photo)

Milky quartz with iron-stained matrix

Quartz (silicon dioxide, SiO₂)

Milky quartz (quartz-rich rock fragment)

Quartz, silicon dioxide (SiO₂)

Basalt with Peridotite Xenolith

Mafic Igneous Rock with Peridotite Inclusion (Olivine-rich)

Milky quartz (likely quartz-rich vein fragment)

Quartz, silicon dioxide (SiO₂)

Quartz (Gravel Fragment)

Silicon Dioxide (SiO2)

Quartz (Druzy/Macro-crystalline)

Silicon Dioxide (SiO2)