Sedimentary Rock (Metamorphosed)

Quartz-rich rock, likely milky quartz or quartzite

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

Quartz-rich rock, likely milky quartz or quartzite

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

Weathered gray metamorphic rock, likely slate or phyllite

Foliated metapelite; commonly muscovite–quartz–chlorite, possibly with iron-oxide staining

Tumbled lapis lazuli, blue-green serpentine, and sodalite (likely)

Lapis lazuli: lazurite-bearing rock, chiefly lazurite (Na₃Ca(Si₃Al₃)O₁₂S); serpentine: Mg₃Si₂O₅(OH)₄; sodalite: Na₈(Al₆Si₆O₂₄)Cl₂

Weathered brown rock, possibly iron-stained quartzite or schist

Uncertain from the blurred image; likely quartz-rich metamorphic rock (quartzite) or mica schist

Marble

Metamorphosed Limestone (main mineral: Calcite, CaCO3)

Shale / Mudstone

Laminated Mudrock (Siliciclastic Sedimentary Rock)

Shale (Beach-worn)

Laminated Pelite (primarily clay minerals and quartz)

Iron-stained quartzite or quartz-rich sandstone

Quartzite, predominantly SiO₂, with iron-oxide coatings (hematite/goethite)

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-mica schist; predominantly SiO₂ quartz with iron-oxide staining

Graphite-rich schist (probable graphite flake)

Graphite (C) in graphitic schist; possibly graphite-bearing phyllite

Rounded river pebble, possibly quartz-rich metamorphic rock

Indeterminate; likely quartzite or weathered quartz-bearing schist

Greenstone pebble (likely altered basalt/serpentinite)

Chlorite–epidote amphibolite or serpentinized mafic rock; exact identification requires testing

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with minor dark inclusions

Weathered sandstone or iron-stained quartzite fragment

Quartz-rich sandstone (SiO₂), possibly ferruginous sandstone; exact identification requires testing

Weathered quartz-rich rock, likely chert or quartzite

Quartzite/chert; predominantly microcrystalline quartz (SiO₂), with iron-oxide staining and possible minor feldspar or clay minerals

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite, a metamorphosed quartz sandstone

Rounded river cobble, likely quartz-rich sandstone or quartzite

Indeterminate; probable quartz arenite (sandstone) or low-grade quartzite, chiefly SiO₂

Tumbled banded quartzite or jasper

Silica-rich quartzite; likely iron-oxide-stained quartz (SiO₂)

Weathered quartz-rich rock, possibly quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂)

Weathered Sedimentary Rock

Sedimentary Rock

Weathered sandstone or quartz-rich metasedimentary pebble

Likely quartz arenite (sandstone), possibly weakly metamorphosed; predominantly SiO₂ quartz with feldspar and iron-oxide cement

Quartz-bearing iron-rich rock, possibly quartzite or hydrothermal breccia

Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite; exact host rock is uncertain from the photograph

Quartzite cobble

Quartzite, dominantly microcrystalline quartz (SiO₂), with iron-oxide staining and possible feldspar/mica

Polished black stone, likely basalt or amphibolite

Basalt (fine-grained mafic rock), possibly amphibolite; primarily plagioclase and pyroxene/amphibole

Biotite-rich schist

Mica schist, chiefly quartz + biotite mica (locally muscovite); composition varies

Iron-rich metamorphic rock, likely banded iron formation fragment

Hematite–magnetite-rich quartzite (BIF); Fe₂O₃/Fe₃O₄ with SiO₂

Weathered quartz-rich rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly iron-oxide stained

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica/amphibole

Banded iron formation (banded ironstone)

BIF, chiefly hematite/magnetite and microcrystalline quartz (chert); locally limonite/goethite

Sandstone or Mudstone

Sedimentary Rock

Weathered quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite, a metamorphosed quartz sandstone

Likely granite or granitic gneiss

Quartz–feldspar–mica aggregate; possibly foliated granitic gneiss

Weathered granite or granitic gneiss

Feldspar–quartz–mica aggregate; likely granite, possibly weakly foliated gneiss

Weathered sulfide-bearing rock, likely pyrite-rich schist or quartzite

Quartz–mica rock with disseminated pyrite (FeS₂), possibly altered schist

Shale

Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)

White quartz-rich river pebble, likely quartzite or milky quartz

Quartzite (mostly SiO₂); possibly massive milky quartz

Shale

Argillaceous sedimentary rock

Weathered greenstone

Metabasalt (greenstone), likely chlorite–actinolite–epidote rock

Weathered greenstone pebble

Metamorphosed mafic rock, commonly metabasalt or greenschist (exact identification requires testing)

Tumbled reddish-brown pebble, likely sandstone or iron-rich quartzite

Probable ferruginous sandstone (quartz-rich; SiO₂ with iron oxides), possibly quartzite

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica (possibly metamorphosed to gneiss)