Unknown (Likely Sedimentary Or Metamorphic)

Weathered metamorphic rock, likely gneiss or schist

Indeterminate foliated silicate rock; commonly quartz–feldspar–mica assemblage

Tumbled chalcedony (likely milky quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartzite

Rounded sedimentary pebble, likely mudstone or shale

Argillite/mudstone; predominantly compacted clay minerals with quartz and iron oxides

Likely metallic ore specimen

Undetermined; the silvery, reflective surface may indicate specular hematite (Fe₂O₃), but the image is insufficient for reliable identification.

Pyrite-bearing rock (iron pyrite)

Pyrite, FeS₂, likely disseminated or massive in a host rock

Weathered quartz-bearing rock, possibly calcite vein fragment

Indeterminate; likely quartz (SiO₂) with carbonate minerals such as calcite (CaCO₃)

Metallic sulfide-bearing metamorphic rock

Likely graphitic schist or sulfide-rich schist, with possible pyrite/arsenopyrite and mica

Iron-stained quartz vein rock

Quartz-rich vein material, predominantly SiO₂, with iron oxyhydroxides (goethite/limonite) and likely sulfide alteration

Quartz-bearing dark rock, possibly hornfels or basalt

Probable quartz–feldspar rock; exact identification requires testing

Banded gneiss (likely amphibolite-bearing gneiss)

Gneiss; quartz–feldspar–mica/amphibole aggregate

Biotite-rich gneiss with a dark mafic band

Banded gneiss, likely quartz–feldspar–biotite gneiss (exact minerals uncertain from the image)

Weathered gray metamorphic rock, likely gneiss or schist

Probable quartz–feldspar–mica gneiss/schist; exact identification requires a fresh surface and tests

Small pale mineral fragment

Unidentified; possibly quartz, calcite, or feldspar

Banded gneiss

Gneiss, likely quartz–feldspar–mica gneiss

Tumbled blue-gray stone, likely quartzite or chalcedony

Quartz-rich rock; predominantly microcrystalline or granular SiO₂, identification uncertain from image

Gneiss (Green Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Weathered gray slate or phyllite pebble

Fine-grained, foliated metamorphic rock; exact identification requires closer examination

Banded gneiss (likely weathered orthogneiss)

Gneiss; predominantly quartz–feldspar–mica, with possible iron-oxide staining

Clear crystal-bead bracelet, possibly quartz

Unidentified transparent mineral beads; quartz (SiO₂) is one possibility

Blue-green faceted gemstone, possibly glass or synthetic material

Not identifiable from the image; possible synthetic spinel or glass

Likely mica-rich schist (possibly phyllite)

Muscovite–biotite schist; exact identification requires examination of a fresh surface

Banded metamorphic rock, likely gneiss

Banded quartzofeldspathic gneiss (probable paragneiss or orthogneiss)

Milky quartz-bearing rock, possibly quartzite

Quartz (SiO₂), likely in a quartzite or quartz-rich vein

Banded gneiss

Foliated quartz–feldspar gneiss, likely biotite-bearing

Polished garnet-bearing metamorphic rock

Likely garnet mica schist or garnet-bearing gneiss; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃

Gray metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and tests

Quartz-bearing metamorphic rock, possibly quartzite or hornfels

Mostly quartz (SiO₂), with probable iron-oxide and dark silicate minerals

River Pebble (Gneiss or Granite)

Metamorphic Rock (likely Gneiss or Granitic composition)

Quartz-rich rock, likely milky quartz vein material

Mostly quartz (SiO₂); exact rock type cannot be determined from the image alone

Pyrite (likely)

Iron disulfide, FeS₂; commonly called fool’s gold

Iron-stained milky quartz

Quartz (SiO₂), with reddish-brown iron-oxide staining

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

Weathered quartz-rich rock, possibly quartzite

Quartzite (tentative identification; exact rock type cannot be confirmed from the image)

Polished green banded stone, likely serpentine or altered greenstone

Probable serpentinite/greenstone; commonly dominated by serpentine-group minerals, chlorite, epidote, or actinolite

Weathered gray metamorphic rock, likely slate or phyllite

Foliated metapelite; composition commonly quartz, mica, and chlorite

Likely marble (calcite-rich metamorphic rock)

Calcite marble, composed mainly of calcite (CaCO₃); identification is provisional from the image

Banded gneiss

Gneiss, likely biotite–quartz–feldspar gneiss

Serpentine (polished/tumbled)

Serpentinite; chiefly antigorite, lizardite, and chrysotile, commonly with magnetite and carbonate minerals

Tumbled brown quartzite or jasper

Quartzite (mostly SiO₂), possibly iron-rich jasper (microcrystalline quartz)

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Weathered metallic sulfide ore, likely pyrite-bearing rock

Pyrite (FeS₂), possibly in a quartz–iron-oxide host

Milky quartz-rich rock

Quartz, SiO₂; possibly quartzite or massive vein quartz