Not A Rock Or Mineral (Anthropogenic Material)

Crushed stone aggregate

Mixed lithic aggregate; individual fragments cannot be identified from the image

Iron Slag

Ferrous Slag (Silicate/Oxide mixture)

Chert (Arrowhead Debitage or Flake)

Microcrystalline silica (SiO2)

Iron Slag

Ferrous Slag (complex silicate and oxide byproduct)

Note: No specimen visible

Iron-stained quartz-rich rock

Likely quartz with iron-oxide staining (SiO₂ with goethite/limonite); exact identification is uncertain from the photo

Angular gray rock fragments

Unidentified fine-grained rock; the image does not show diagnostic features sufficient for a specific identification

Sandstone

Arenite (primary component SiO2)

Sandstone

Arenite (SiO2 based)

Ferro-silicate Slag

Industrial Vitrified Slag (High-silica amorphous glass)

Sandstone

Sandstone (SiO2-rich clastic sedimentary rock)

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Sandstone

Arenite

Concrete

Hydrated Portland Cement Aggregate Composite

Iron-stained rock fragment, possibly quartz-rich

Unidentified quartz-rich rock with iron-oxide staining (likely hematite/goethite)

Quartz with Mafic/Chlorite Veins

Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining

Slag (Industrial Glassy Byproduct)

Ferro-silicate Slag

Black-and-white bicolored pebble

Likely basalt with a pale felsic or carbonate coating/inclusion; exact identification requires testing

Slag

Ferrous Slag (Siliceous industrial waste)

Rounded quartz-rich pebble

Lithic pebble; likely quartz/quartzite with iron-oxide staining

Sandstone with Lichen and Iron Oxide Staining

Quartz Arenite / Sandstone

Coarse-grained gray metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss (probable)

Asphalt Pavement (with aggregate)

Asphalt concrete

Sandstone

Clastic sedimentary rock (primarily SiO2)

Asphalt Chunk

Asphalt concrete

Pale quartz-rich stone, possibly calcite

Likely quartz (SiO₂) or calcite (CaCO₃); image resolution prevents confident separation

Slag (Industrial Byproduct)

Ferrous/Non-ferrous Silicate

Sedimentary Rock (Limestone or Siltstone pebble)

Sedimentary rock fragment

Likely quartz-rich rock fragment

Indeterminate; possibly quartz-bearing granite or quartzite

Agate

Cryptocrystalline quartz, Chalcedony (SiO2)

Slag (Industrial By-product)

Glassy silicate or metallic smelting residue

Sandstone (Tumbled/River Pebble)

Arenite (composed primarily of SiO2)

Quartz-rich rock, likely granite or quartz-bearing metamorphic rock

Undetermined; possibly granitic rock composed mainly of quartz and feldspar, with mica or other dark minerals

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

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

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Yellow-brown stone or mineral fragment

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

Chert Arrowhead

Cryptocrystalline microcrystalline Quartz (SiO2)

Iron Slag

Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)

Blue-gray stone pebble (possibly slag or a weathered rock)

Unidentified fine-grained rock; composition cannot be determined from the image

Sandstone

Arenite (SiO2 primarily)

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

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