Industrial Byproduct (Anthropogenic Rock)

Sandstone with Iron Staining

Arenite (SiO2 with Fe-oxide impurities)

Likely weathered river pebble

Unidentified rounded lithic pebble; the image does not show enough detail to determine its rock species

Small weathered rock fragment, possibly quartz-rich

Unidentified lithic fragment; species cannot be determined from the image

Quartzite

Quartzite (primarily SiO2)

Quartz Vein with Sulfides

Silicon Dioxide with Pyrite and Tourmaline (SiO2)

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

River Pebble (Gravel)

Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)

Coal

Bituminous Coal

River Pebble (Quartzite/Chert)

Quartzite with inclusions (SiO2)

Pegmatite

Coarse-grained igneous rock

Diamond (in Matrix)

Carbon (C)

Polished brecciated jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with angular mineral fragments cemented in silica

Quartz in Matrix

Silicon Dioxide (SiO2) in host rock matrix

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Asphalt (Bituminous Slate/Sandstone)

Asphaltum / Bituminous Rock

Shale (possibly Carbonaceous or Oil Shale)

Argillaceous Sedimentary Rock

Gravel (likely Basalt or Greywacke)

Basalt (Mafic volcanic rock)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) vein cutting through host rock

Possible basalt or iron-rich slag

Basalt (tentative; identification uncertain from image)

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material

Likely weathered quartz-rich pebble

Quartz-bearing rock; exact rock type cannot be determined from the image

Aura Quartz (Coated Quartz)

Silicon Dioxide (SiO2) treated with metallic vapor

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Sea Glass

Amorphous Silica (SiO2) with various additives

Banded agate (chalcedony)

Agate, a banded variety of microcrystalline quartz (SiO₂)

Coal (Bituminous / Anthracite)

Organic Sedimentary Rock (Carbonaceous Rock)

Man-made Carved Stone (Scream Mask/Skull motif)

Carved Soapstone or Serpentine-rich rock

Granite Gravel (Pebble)

Intrusive Felsic Igneous Rock

Red Quartz (Druzy)

Silicon Dioxide (SiO2) with Hematite inclusions

Green-gray stone pebble (not reliably identifiable from the image)

Undetermined; possibly a fine-grained sedimentary rock such as mudstone or siltstone

Diamond ring (likely a faceted clear gemstone)

Diamond, crystalline carbon (C); the setting appears to be gold-colored metal

Weathered rock fragment (exact type uncertain)

Unidentified fine-grained rock; image does not support a reliable species-level identification

Small brown pebble, likely iron-stained quartz or chert

Unidentified quartz-rich or microcrystalline silica pebble (SiO₂)

N/A - Man-made object (Jewelry Chain)

Antiqued or Oxidized Metal Chain (often Steel or Brass)

Polished dark stone, likely basalt or fine-grained mafic rock

Basalt (approximately; commonly plagioclase, pyroxene, and minor olivine/magnetite)

Possible iron-rich chert or slag-like rock

Microcrystalline quartz (SiO₂), possibly iron-stained chert; exact identification is uncertain from the image

Peridotite (Olivine Rock)

Peridotite (composed largely of olivine, (Mg, Fe)2SiO4)

Small pale pebble, possibly quartz-rich rock

Indeterminate from image; likely quartz-bearing pebble (SiO₂)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cement)

Coal (Bituminous / Anthracite)

Carbonaceous Sedimentary Rock (C)

Dacite

Dacite (intermediate volcanic rock high in silica)

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)