Unknown (Likely Sedimentary Or Metamorphic)

Likely serpentinite with a polished dark-green serpentine pebble

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), commonly with magnetite and minor chromite/talc

Greenstone pebble (likely serpentine-rich)

Serpentinite or chlorite-rich metamorphic rock; exact identification is uncertain from the photograph

Fossil-bearing sedimentary rock (possible bone or shell fossil)

Unidentified fossiliferous sedimentary matrix; exact fossil and host rock cannot be determined from the image

Likely ironstone or iron-oxide–stained pebble

Iron-rich concretion, probably goethite/limonite (FeO(OH)·nH₂O) coating a rock fragment

Rounded river pebble, likely quartz-rich stone

Unidentified lithic clast; exact mineralogy cannot be determined from the image

Quartz-rich rock, likely quartzite

Quartzite (predominantly crystalline quartz, SiO₂)

Likely weathered quartz-rich rock fragment

Indeterminate; possibly quartz-bearing sandstone or chert with iron-oxide staining

Blue gemstone in a decorative setting (possibly blue spinel or sapphire)

Unidentified blue faceted gemstone; sapphire is corundum (Al₂O₃), while spinel is MgAl₂O₄

Rounded river stone (likely iron-stained sandstone or siltstone)

Indeterminate ferruginous sandstone/siltstone; composition cannot be confirmed from the image

Small rounded pebble, likely quartz-rich river or beach stone

Unidentified lithic pebble; exact rock type cannot be determined from the image

Rounded brown river pebble

Indeterminate lithic fragment; possibly weathered sandstone, mudstone, or basalt

Green calcite-bearing rock (likely calcite on a pale matrix)

Calcite, CaCO₃; exact matrix and green coloring cannot be determined from the image

Iron-rich conglomerate or breccia (tentative)

Poorly sorted lithic conglomerate/breccia, with iron-oxide staining; exact composition cannot be determined from the photo

Unidentified polished mineral specimen

Indeterminate; likely a pale feldspar or quartz-bearing material

Possible iron-nickel meteorite

Unclassified suspected meteorite; composition and origin cannot be confirmed from the image

Rounded gray-green stone, likely fine-grained sandstone or siltstone

Indeterminate clastic sedimentary rock; exact identification requires closer examination

Greenstone, possibly serpentine or altered basalt

Serpentinite (Mg₃Si₂O₅(OH)₄) or chlorite-epidote altered basalt; identification is uncertain from the image

Fossil-bearing rock, possibly a fossiliferous sandstone or limestone

Unidentified sedimentary matrix with fossil impressions; exact fossil and rock cannot be determined from the image

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite-bearing greenschist; exact identification requires testing

Pink potassium feldspar (likely orthoclase)

Orthoclase, KAlSi₃O₈

Serpentinite (likely)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, commonly with magnetite and minor carbonates

Likely ironstone or iron-rich sandstone fragment

Iron-oxide-cemented sandstone; exact mineral composition cannot be confirmed from the photograph

Weathered, iron-stained rock pebble

Indeterminate; possibly iron-oxide-cemented sandstone or laterite

Rounded pebble with a brown mineral or rock inclusion

Unidentified lithic pebble; the pale matrix and brown patch cannot be identified reliably from the image

Likely dark smoky quartz

Quartz, silicon dioxide (SiO₂); identification is tentative from the photo

Weathered quartzite

Quartzite, composed predominantly of quartz (SiO₂)

Rounded gray-green pebble, possibly serpentinite

Unidentified greenish metamorphic rock; serpentinite is a tentative visual match

Dark, veined metamorphic rock (possibly gneiss or schist)

Undetermined from the photograph; likely a foliated, quartz-veined metamorphic rock

Serpentine (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals such as lizardite, antigorite, or chrysotile; exact identification cannot be confirmed from the image alone.

Polished amber-colored stone, possibly chert or jasper

Uncertain from image; likely microcrystalline quartz (SiO₂) if chert/jasper

Rounded river cobble, likely weathered volcanic or metamorphic rock

Indeterminate from photograph; possible basaltic-andesite, rhyolite, or quartz-rich metamorphic lithology

Likely limestone fragment

Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image

Unknown Tumbled Stone

Unknown (Too Blurry)

Small rounded quartz-rich pebble

Likely quartz (SiO₂), possibly iron-stained or mixed with other minerals

Rounded river pebble, likely quartzite

Quartzite (quartz-rich rock; identification from appearance is provisional)

Rounded gray pebble, likely granite or a similar crystalline rock

Undetermined; possibly granitic rock composed mainly of quartz, feldspar, and dark mica

Small brown stone, possibly a weathered quartz-rich pebble

Undetermined; the image does not show enough detail for a reliable identification

Small rounded pebble, possibly quartz-rich stone

Indeterminate from image; likely quartz-bearing silicate rock

Likely iron-rich concretion or weathered rock pebble

Uncertain from the image; possibly an iron-oxide-cemented concretion (goethite/hematite)

Tumbled greenstone (likely serpentine-rich)

Greenstone; commonly metamorphosed mafic rock composed of actinolite/chlorite with epidote and albite

Weathered metallic sulfide fragment, possibly pyrite-bearing rock

Likely iron sulfide (pyrite, FeS₂) in a weathered host rock; exact identification requires testing

Pyrite-bearing schist

Likely pyrite (FeS₂) in a mica-rich schist; exact identification requires testing