Indeterminate

Rounded river pebbles (mixed lithologies)

Water-worn clasts; individual stones cannot be identified precisely from the image

Small pink mineral fragment

Indeterminate; possibly rose quartz or feldspar

Unidentified small mineral fragments

Likely quartz- or feldspar-rich material; species cannot be determined reliably from the image

Quartz-bearing reddish metamorphic rock, possibly ferruginous quartzite or jasper vein

Quartz (SiO₂) with iron oxides; likely quartzite or iron-rich jasper

Small white crystalline mineral fragment

Indeterminate; possibly calcite or quartz

Small pale mineral fragment

Indeterminate; possibly quartz or calcite

Bivalve Fossil (Internal Mold)

Class Bivalvia (Indeterminate genus)

Rounded gray pebble, likely limestone or fine-grained basalt

Indeterminate from image; possible micritic limestone (calcite, CaCO₃) or basalt (plagioclase, pyroxene, minor oxides)

Likely weathered metallic mineral or slag fragment

Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag

Fossilized shell in sedimentary matrix

Likely a bivalve or brachiopod fossil preserved in carbonate-rich sediment; exact identification requires closer examination.

Likely milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Polished ironstone or hematite-rich river pebble

Ironstone, likely hematite/goethite-bearing quartz or chert (Fe₂O₃/FeO(OH) with silica)

Metallic sulfide ore specimen

Likely pyrite-bearing massive sulfide, possibly pyrrhotite or galena; exact identification requires testing

Tiny rounded metallic-looking pebble, possibly pyrite or a metal-rich mineral

Uncertain from image; possible pyrite (FeS₂), chalcopyrite (CuFeS₂), or magnetite (Fe₃O₄)

Small red-brown mineral or rock fragment

Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide

Gem-set gold ring

Gold alloy setting with a colorless faceted gemstone, possibly quartz or glass; the stone cannot be identified reliably from the image

Likely small metallic meteorite fragments

Unclassified iron or stony-iron meteorite; mineralogy cannot be confirmed from the image

Quartz-bearing dark rock, possibly hornfels or basalt

Probable quartz–feldspar rock; exact identification requires testing

Polished sedimentary pebble, likely sandstone or quartzite

Quartz-rich sandstone (SiO₂-dominant), possibly weakly metamorphosed quartzite

Tumbled sandstone or weathered limestone pebble

Likely quartz-rich sandstone (SiO₂) or calcarenite/limestone (CaCO₃)

Iron-rich weathered rock, possibly goethite/limonite-bearing sandstone or ironstone

Limonite (hydrated iron oxides; chiefly goethite, FeO(OH), with hematite, Fe₂O₃)

Unidentified gray-brown stone

Likely fine-grained quartz–feldspar rock; exact identification is not possible from this close, blurred image

Quartz-bearing rock fragment

Likely quartz (SiO₂) with iron-oxide staining and possible host-rock grains

Iron-stained quartz or chert fragment

Quartz (SiO₂), possibly microcrystalline quartz/chert with limonite staining

Pale-green schist fragment

Chlorite–sericite schist, possibly containing epidote or actinolite

Weathered sandstone pebble

Quartz-rich sandstone, likely iron-oxide-stained (SiO₂-dominant)

Rounded brown sandstone or weathered river cobble

Likely quartz-rich sandstone; exact identification requires a fresh surface and tests

Fossil fish specimen

Fossilized fish vertebrate, likely an articulated fish impression; exact taxon indeterminate

Mica-rich schist (probable)

Foliated quartz–mica schist; likely containing quartz, muscovite and/or biotite

Likely weathered porphyritic igneous rock

Provisional identification: altered basaltic-andesite or rhyolite; exact mineralogy cannot be confirmed from this close, flash-lit image

Weathered quartz-rich pebble

Likely milky quartz (SiO₂), possibly a quartz-rich vein fragment

Weathered iron-rich quartzite or chert nodule

Quartzite/chert, predominantly microcrystalline SiO₂ with iron-oxide staining

Rounded sandstone pebble

Quartz-rich sandstone, commonly arkose or lithic sandstone

Flagstone, likely weathered sandstone or limestone

Layered clastic carbonate rock; exact mineralogy cannot be confirmed from the image

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; mainly plagioclase feldspar and pyroxene, possibly olivine or magnetite

Likely tumbled yellow-orange mineral or glassy stone

Indeterminate from photograph; possibilities include yellow jasper, calcite, agate, or dyed quartz

Weathered quartz-rich pebble

Likely quartz aggregate, SiO₂, possibly quartzite or silicified rock

Weathered iron-rich stone, possibly jasper or chert

Microcrystalline quartz (SiO₂), likely stained by iron oxides/hydroxides

Weathered river pebble, likely quartz-rich sandstone or iron-stained quartzite

Provisional identification: quartz-rich sandstone/quartzite; exact composition cannot be confirmed from the image

Likely dark purple fluorite or another polished mineral specimen

Indeterminate from the image; fluorite is CaF₂

Likely sandstone

Quartz-rich sandstone (indeterminate variety)

Fossil brachiopod shell

Brachiopoda; exact genus/species indeterminate