Unknown (Likely Sedimentary Or Metamorphic)

Mica-rich metamorphic rock, likely schist

Muscovite/biotite schist, possibly quartz-bearing

Quartzite (or Iron-Stained Quartz Pebble)

Silicon Dioxide (SiO2) with Ferric Oxide inclusions

Foliated metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss (provisional identification)

Iron-rich metamorphic rock (probable limonite/goethite-bearing schist)

Quartz–mica schist with iron oxyhydroxides, chiefly goethite (FeO(OH)) and limonite (amorphous hydrated iron oxides)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Weathered quartz-rich rock, likely sandstone or quartzite

Quartz sandstone (possibly weakly metamorphosed quartzite); predominantly SiO₂

Weathered iron-rich rock, possibly garnet schist or mica schist

Foliated metamorphic rock; likely mica schist with iron oxides and quartz, but exact identification is uncertain from the image

Likely graphite-rich schist (possibly galena-bearing metamorphic rock)

Graphite schist; chiefly quartz–mica with graphite (identification uncertain from photograph)

Gneiss (Granitic Gneiss)

Gneiss

Quartz-rich metamorphic rock, likely mica schist

Mica schist; chiefly quartz (SiO₂) and mica, likely muscovite/biotite, with possible feldspar

Weathered sandstone or quartzite cobble

Quartz-rich sandstone, possibly weakly metamorphosed to quartzite (SiO₂-rich)

Banded metamorphic rock, likely gneiss or metasedimentary slate

Quartz–feldspar–mica gneiss (tentative), possibly containing iron-oxide veins

Weathered quartz-rich rock, likely arkose or quartzite

Quartz-dominant siliciclastic rock; probable arkose (quartz + feldspar), possibly weakly metamorphosed quartzite

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Weathered quartz-rich metamorphic pebble

Likely quartzite or quartz-mica schist; identification is uncertain from the photograph

Uncertain dark metamorphic rock, likely schist or slate

Foliated silicate rock; possibly chlorite–mica schist or slate

Weathered brown rock, likely sandstone

Quartz-rich sandstone (composition uncertain from image)

Conical fossil shell or shell fragment

Likely a gastropod shell fragment; exact taxon indeterminate from the image

Quartz chunk

Silicon dioxide (SiO2)

Mixed metamorphic rock fragments, likely garnet-bearing schist and quartzite

Quartz–feldspar–mica schist/quartzite; red grains may be almandine garnet

Quartz-bearing metamorphic rock, likely quartzite or hornfels

Quartz (SiO₂) in a fine-grained silicate matrix; exact rock identification requires testing

Weathered metamorphic rock, likely mica schist or gneiss

Quartz–feldspar–mica schist/gneiss; exact identification is uncertain from the photograph

Yellow-brown quartz-rich pebble (possibly iron-stained chert or quartzite)

Quartz (SiO₂), likely with iron-oxide staining; exact identification requires hardness and acid tests

Rounded river pebble, likely weathered quartzite or sandstone

Quartzite (mostly SiO₂), possibly ferruginous sandstone

Graphite

Graphite (Native Carbon, C)

Likely graphite-rich schist

Graphitic schist; chiefly graphite and quartz/mica

Quartz-bearing metamorphic rock, likely mica schist

Mica schist with quartz; commonly muscovite/biotite mica and SiO₂ quartz

Quartz-veined metamorphic rock, likely schist or gneiss

Quartz–feldspar–mica rock; exact identification requires testing

Quartz-rich gneiss

Foliated quartz–feldspar–mica gneiss, possibly migmatitic

Weathered sulfide-bearing metamorphic rock (likely pyrite- or chalcopyrite-rich schist)

Quartz–mica schist with iron sulfides; possible pyrite (FeS₂) and chalcopyrite (CuFeS₂)

Dark gray slate (possibly argillite or shale)

Slate, a low-grade metamorphic rock derived mainly from shale; composition commonly quartz, illite/muscovite, chlorite, and clay minerals

Banded gneiss pebble

Gneiss, chiefly quartz–feldspar with dark biotite/hornblende bands

Quartz fragment

Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz

Likely weathered schist or gneiss fragment

Micaceous quartz-feldspar metamorphic rock; exact identification requires testing

Yellow Quartzite (Onyx Pebble)

Silicon Dioxide (SiO2) - Quartzite

Metallic sulfide mineral fragment, likely galena

Galena (lead sulfide, PbS), tentative identification

Banded gneiss

Gneiss, likely quartz–feldspar–biotite gneiss

Banded limestone or marble pebble

Calcite-rich carbonate rock; likely banded marble (CaCO₃)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Tumbled jasper pebble

Microcrystalline quartz (SiO₂), commonly with iron-oxide inclusions

Mica-rich metamorphic rock, likely biotite schist

Biotite schist; chiefly quartz, feldspar, and biotite mica

Banded metamorphic rock, likely gneiss

Gneiss; predominantly quartz–feldspar with mica/amphibole minerals