Indeterminate

Fossil plant impression, likely fern or leaf

Indeterminate fossilized vascular-plant compression; possibly a fern frond or other Paleozoic plant

Rounded river pebble, likely quartz-rich sandstone or fine-grained quartzite

Indeterminate quartz-rich lithic clast; likely quartz sandstone (SiO₂-rich) or quartzite

Polished/tumbled brown-and-white mineral fragment

Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral

Small seashell fossil or shell fragment

Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate

Weathered quartz-bearing rock, possibly rhyolite or granite

Indeterminate felsic igneous rock; likely quartz–feldspar aggregate with iron-oxide staining

Rounded greenish-gold rock or mineral pebble

Indeterminate; possibly serpentine-rich stone, weathered sulfide, or iron-stained metamorphic rock

Unidentified dark mineral or rock specimen

Indeterminate from the severely blurred image; possible dark igneous rock or opaque mineral

Small polished or naturally worn stone, possibly quartz-bearing rock

Indeterminate from the blurred image; likely quartz (SiO₂) or a pale feldspar-rich fragment

Rounded gray pebble, likely quartz-rich sandstone or chert

Indeterminate lithic clast; possibly quartz arenite (quartz sandstone) or microcrystalline quartz (chert)

Tumbled dark stone, possibly chert or basalt

Indeterminate; likely fine-grained basalt (plagioclase–pyroxene) or microcrystalline chert (quartz, SiO₂)

Likely weathered sandstone or iron-rich chert fragment

Indeterminate; probable quartz-rich sandstone (SiO₂) with iron-oxide cement, possibly chert

Rounded weathered pebble, likely sandstone or altered limestone

Indeterminate clastic carbonate/siliciclastic rock; exact identification requires a fresh surface and tests

Fossilized bivalve shell

Bivalvia indeterminate; likely a fossil cockle or clam shell, aragonite/calcite replaced or preserved

Weathered sandstone or limestone fragment

Indeterminate clastic carbonate/siliciclastic rock; likely quartz-rich sandstone or porous limestone

Rounded river cobble, likely weathered sandstone or quartz-rich metasandstone

Indeterminate sandstone; commonly quartz (SiO₂) with feldspar, lithic grains, and iron-oxide cement

Gray-green rough stone, possibly serpentinite

Indeterminate from the photograph; possible serpentinite, a rock composed mainly of serpentine-group minerals

Tumbled stone, possibly green jasper or serpentine

Indeterminate from the photo; likely a jasper (microcrystalline quartz, SiO₂) or serpentine-group material

Weathered iron-rich rock, possibly laterite or ironstone

Indeterminate ferruginous rock; likely iron-oxide-cemented material (goethite/limonite ± hematite)

Weathered brown rock, likely iron-rich sandstone or laterite

Indeterminate; probable ferruginous sandstone/ironstone, composed mainly of quartz with iron-oxide cement

Fossilized shell or shell fragment

Indeterminate mollusk shell; likely fossilized bivalve or gastropod, composed mainly of calcite/aragonite

Polished banded stone, likely labradorite or banded gabbro

Indeterminate from image; possibly plagioclase-rich gabbro/anorthosite or labradorite-bearing rock

Greenish rough stone, possibly serpentine or soapstone

Indeterminate from the image; possible serpentinite (serpentine-group minerals) or talc-rich soapstone

Rounded brown river pebble

Indeterminate lithic fragment; likely weathered sandstone, mudstone, or fine-grained volcanic rock

Fossilized bone or tooth fragment

Indeterminate vertebrate fossil; likely permineralized bone, possibly a large mammal or marine vertebrate

Unidentified green-gray mineral/rock fragment

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

Small polished amber or brown gemstone

Indeterminate from image; possibly amber (fossilized plant resin) or brown chalcedony/quartz

Rounded quartz-rich river cobble (probable rhyolite/granite-derived stone)

Indeterminate felsic igneous cobble; likely quartz–feldspar aggregate with minor iron oxides

Faceted gemstone pendant, likely quartz or citrine

Indeterminate from photograph; likely quartz (SiO₂), possibly yellow citrine or treated quartz

Unidentified polished stone or mineral specimen

Indeterminate from the blurred photograph; possibly a polished pale chalcedony, quartz, or feldspar piece

Weathered iron-stained quartz-rich rock, possibly rhyolite or quartzite

Indeterminate silica-rich rock; likely quartz (SiO₂) with iron oxides and clay alteration

Unidentified fine mineral/rock powder

Indeterminate from image; possibly crushed quartz-rich sand or finely milled rock

Fossiliferous pebble, possibly a crinoid or shell fragment

Indeterminate bioclast in a dark sedimentary matrix; likely carbonate fossil material (calcite, CaCO₃)

Polished black stone, likely basalt or black jasper

Indeterminate; possible fine-grained basalt (plagioclase–pyroxene) or black jasper/microcrystalline quartz

Fossilized coral fragment

Fossil coral, commonly colonial scleractinian coral (order Scleractinia); exact genus indeterminate

Uncertain small mineral specimen, possibly fluorite or quartz-bearing rock

Indeterminate; pale green/purple material may include fluorite (CaF₂) or quartz (SiO₂)

Fossil bivalve shell

Likely a fossilized oyster or other marine bivalve; exact genus is indeterminate from the image

Weathered iron-stained stone, likely graywacke or altered sandstone

Indeterminate lithic fragment; probable quartz-rich sandstone/graywacke with iron-oxide staining

Rounded sandstone or quartz-rich river cobble

Indeterminate lithic sandstone; chiefly quartz (SiO₂) with feldspar and iron-oxide/calcite cement

Fossil bone fragment, likely vertebrate limb or rib bone

Fossilized bone (apatite-rich hydroxyapatite, Ca₅(PO₄)₃OH); exact taxon indeterminate

Blue glassy mineral fragment, possibly kyanite or blue quartz

Indeterminate from image; candidates include kyanite (Al₂SiO₅) or blue quartz (SiO₂)

Fossil bone or tooth fragment

Indeterminate fossilized vertebrate bone/tooth; taxonomic identification is not possible from this blurred image

Weathered golden-brown mineral/rock fragment

Indeterminate from image; possibly iron-stained quartz, feldspar, or a sulfide-bearing rock