Indeterminate

Likely polished dark gemstone cabochon

Indeterminate; possibly black chalcedony/agate, obsidian, or glass imitation

Tumbled brown stone, possibly jasper or iron-rich chert

Indeterminate; likely microcrystalline quartz (SiO₂) with iron-oxide coloration

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz (SiO₂) with feldspar and minor dark minerals

Small metallic-looking mineral/rock fragment

Indeterminate from image; possibly galena, hematite, or metallic slag

Unidentified gray stone/concrete-like fragment

Indeterminate; likely a fine-grained carbonate or cementitious geological fragment

Fossilized shell or small fossil fragment

Indeterminate fossil; possibly a partial gastropod or bivalve, mineralized with calcite

Fossilized gastropod (snail)

Silicified or calcite-replaced gastropod fossil; exact genus indeterminate

Weathered brown rock fragment

Indeterminate; possibly iron-stained sandstone, mudstone, or weathered limestone

Weathered quartz-rich cobble, likely sandstone or quartzite

Indeterminate; probable quartz arenite (sandstone) or quartzite, dominated by SiO₂

Tiny rounded brown mineral grain

Indeterminate; possibly iron oxide, garnet, or a weathered sulfide grain

Small pale mineral/rock fragment

Indeterminate; possibly weathered quartz, calcite, or light-colored limestone

Likely galena-bearing ore or graphite-rich sulfide fragment

Indeterminate; possibly galena (PbS) with quartz, or graphite-rich schist

Fossilized bone fragment

Mineralized vertebrate bone, likely mammalian; exact taxon indeterminate

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, potentially altered granite

Rounded brown pebble, likely sandstone or weathered iron-rich rock

Indeterminate; possibly ferruginous sandstone (quartz-rich sedimentary rock)

Likely polished/tumbled dark mineral or glassy rock fragment

Indeterminate from image; possibly hornblende, schorl tourmaline, or obsidian

Possible iron-rich pebble or weathered basalt

Indeterminate; likely iron-stained mafic rock, possibly basalt

Polished brown river pebble (likely chert or fine-grained sandstone)

Indeterminate; probable microcrystalline quartz (chert) or quartz-rich sandstone

Rounded gray pebble

Indeterminate; likely fine-grained quartz-rich silicate rock

Fossilized shell or coral fragment

Indeterminate fossil; possibly a gastropod/bivalve fragment or colonial coral

Small metallic mineral fragment

Indeterminate; possibly galena, hematite, magnetite, or metallic meteorite fragment

Small rounded yellow pebble, likely quartz-rich rock

Indeterminate from image; possibly iron-stained quartz or chert

Small rounded pebble

Indeterminate; likely a weathered iron-rich silicate rock or concretion

Small rounded pebble

Indeterminate lithic clast; likely weathered quartzite, sandstone, or chert

Tumbled amber-colored stone, possibly orange calcite or carnelian

Indeterminate from image; likely calcite (CaCO₃) or chalcedony (SiO₂)

Weathered granitic or metamorphic rock fragment

Indeterminate; likely quartz–feldspar–mica-bearing granitoid or gneiss

Dark mineral-rich rock fragment

Indeterminate; possibly dark quartzite, chert, or weathered igneous rock

Rounded river pebble, likely fine-grained sandstone or siltstone

Indeterminate clastic sedimentary rock; possibly quartz-rich sandstone

Small tumbled orange-brown mineral fragment

Indeterminate; possibly iron-stained quartz, carnelian, or orange calcite

Small rounded stone or mineral fragment

Indeterminate; likely a common quartz- or feldspar-bearing silicate fragment

Fossilized turtle shell or carapace fragment

Indeterminate Testudines; likely a fossil turtle carapace scute/bone

Weathered quartz-rich rock, likely granite or quartzite

Indeterminate; probable quartz–feldspar aggregate, possibly granitic gneiss

Possible fossilized tooth fragment

Indeterminate fossil enamel/dentine; possibly shark tooth fragment

Iron-rich weathered rock fragment

Indeterminate; likely limonite/goethite-bearing sandstone or lateritic ironstone

Tumbled river pebble, likely fine-grained sandstone or mudstone

Indeterminate lithic clast; possibly quartz-rich sandstone or siltstone

Small weathered fossil or mineral fragment

Indeterminate; possibly fossilized shell, bone, or a pale carbonate mineral

Polished white/gray stone, possibly quartz or marble

Indeterminate; likely quartz (SiO₂) or calcite-rich marble (CaCO₃)

Fossil brachiopod or bivalve shell

Indeterminate fossilized carbonate shell; likely a brachiopod (Phylum Brachiopoda)

Rounded dark river pebble

Indeterminate mafic rock, possibly basalt or fine-grained andesite

Unidentified small rock fragment

Indeterminate; appearance may be consistent with a weathered sandstone or limestone fragment

Polished gray-brown stone slab, possibly soapstone or schist

Indeterminate; likely talc-rich soapstone (steatite) or mica schist

Rounded brown river pebble

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