Unknown

Small tan stone (undetermined)

Unidentified fine-grained geological material; species cannot be determined from the image

Small polished, cream-colored stone (possibly quartz or marble)

Unidentified; appearance alone cannot distinguish quartz (SiO₂) from calcite-rich marble (CaCO₃) or another pale stone

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

Indeterminate clastic sedimentary rock; exact identification requires closer examination

Small dark pebble, possibly basalt

Unidentified fine-grained mafic rock; basalt is a tentative visual match

Rounded brown pebble (rock type undetermined)

Unidentified, iron-stained lithic pebble; composition cannot be determined from the photograph

Small fossilized tooth, possibly a shark tooth

Indeterminate fossil tooth; species cannot be identified from this image

Blue-gray stone fragment, possibly slate or fine-grained basalt

Undetermined; appearance is consistent with slate (fine-grained metamorphosed mudstone), but the image is insufficient for reliable identification.

Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

Rounded river pebble (lithology unclear)

Indeterminate natural rock; no specific mineral or rock type can be identified from the image

Likely small iron-rich concretion or weathered mineral fragment

Indeterminate; possibly limonite/goethite-bearing material with quartz or feldspar

Unidentified small rounded mineral/rock fragment

Indeterminate from image; possibly quartz or chalcedony with iron-oxide staining

Vesicular volcanic rock (likely pumice)

Pumice, a highly vesicular volcanic glass; exact identification is uncertain from the image

Undetermined Due to Blur (Possible Flesh-Tone Mineral)

Unknown (Insufficient Visual Clarity)

Quartz-bearing rock fragment

Undetermined quartz-rich rock; visible white material is likely quartz (SiO₂), with dark fine-grained host rock

Likely clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Possible petrified wood or fossilized tooth

Unidentified silicified fossil; exact identification requires close examination

Small reddish-brown pebble, likely iron-rich rock or mineral fragment

Unidentified; possibly iron-oxide–stained quartz or ironstone

Weathered yellow-brown rock pebble

Undetermined; possibly iron-oxide-stained sandstone or mudstone

Quartz-rich river pebble

Likely quartz-rich granitic rock; mainly quartz (SiO₂), with possible feldspar and mica

Possible fossilized bone fragment

Indeterminate vertebrate bone; no taxonomic identification is possible from the image alone

Likely vesicular volcanic rock (possibly pumice or scoria)

Vesicular volcanic rock; exact identification requires a fresh, close-up sample

Possible fossilized bone fragment

Indeterminate mineralized bone; taxon and age cannot be determined from the photo

Small cream-colored tumbled stone, possibly quartz or feldspar

Undetermined; appearance alone is insufficient to identify the mineral

Clear faceted gemstone in an ornate metal bracelet

Unidentified transparent faceted stone; possibilities include quartz (SiO₂), zircon (ZrSiO₄), or glass—image alone cannot distinguish them

Possible green glassy mineral pebble

Undetermined; possibly green aventurine (quartz) or another green mineral

Quartz vein in host rock

Quartz (SiO₂) vein cutting an unidentified, likely metamorphic host rock

Small pale-green stone, possibly serpentine or quartz

Undetermined from the image; no diagnostic features confirm a specific mineral

Weathered, iron-stained rock fragment

Unidentified iron-oxide-stained silicate rock; precise identification is not possible from the image

Unidentified green-gray mineral/rock fragment

Indeterminate from image; possible serpentine-bearing rock or chrysocolla/azurite-bearing material

Unidentified gray rock fragment

Indeterminate from image; possibly quartz- or feldspar-rich silicate material

Fossil-bearing rock, possibly with a fossilized shell or coralline specimen

Indeterminate fossil in sedimentary matrix; precise identification is not possible from the image

Weathered fossil bone fragment

Fossilized vertebrate bone; taxon and age cannot be determined from the image

Probable fossil tooth fragment

Indeterminate fossilized vertebrate tooth; species cannot be identified from this image

Unidentified transparent crystal or mineral fragment

Cannot be determined from the image; possible quartz, but not diagnostic

Fine-grained, banded rock (possibly gneiss)

Unidentified foliated silicate rock; composition cannot be determined from this close-up

Likely ironstone or iron-oxide–stained pebble

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

Small brown rock fragment, possibly iron-stained quartz or chert

Unidentifiable from the photograph; potentially quartz (SiO₂) or microcrystalline silica (chalcedony/chert)

Dark, rounded river pebble (likely basalt or andesite)

Unconfirmed fine-grained volcanic rock; basalt is a plausible identification

Possible ironstone or iron-oxide-rich mineral fragment

Unidentified iron oxide/hydroxide, possibly goethite or limonite

Assorted mineral and rock collection

Mixed specimens; individual species cannot be reliably identified from the image

Unidentified pale mineral or rock specimen

Indeterminate; image quality prevents reliable mineral identification

Reddish-brown weathered rock (specific type uncertain)

Possibly iron-oxide-stained sandstone or siltstone; image alone is insufficient for a firm identification