Industrial Byproduct (Anthropogenic Material)

Quartzite

Quartzite (principally SiO2)

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)

Clay Brick

Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)

Polished ocean jasper (orbicular jasper), probable

Silicified orbicular rhyolite; chiefly microcrystalline quartz (SiO₂)

Polished pietersite cabochon

Pietersite (brecciated fibrous quartz/chalcedony, commonly with riebeckite or crocidolite remnants)

Black glassy volcanic rock, likely scoria or obsidian

Vesicular basaltic scoria (probable); possibly dark obsidian

Blue-green aventurine beads (likely dyed or treated quartz)

Quartz, SiO₂; aventurine is quartz containing fine mineral inclusions

Rose quartz bead bracelet

Quartz, SiO₂ (rose quartz variety)

Diamond

Carbon (C)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Potassium-Rich Silicate Clay (inferred from biological context)

Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)

Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

Concrete

Hydrated Portland Cement Aggregate Composite

Tumbled magnesite

Magnesite (MgCO₃), likely compact or veined magnesite

Tumbled pale-green stone, likely prehnite or serpentine

Most consistent with massive prehnite, Ca₂Al₂Si₃O₁₀(OH)₂; serpentine is a possible alternative

Limestone

Calcium Carbonate (CaCO3)

Tektite (likely indochinite)

Natural silica-rich impact glass; predominantly amorphous SiO₂ with aluminum, iron, magnesium, calcium, and sodium

Rough Diamond

Diamond (Native Carbon, C)

Small dark rock fragment (not identifiable from the image)

Undetermined; no diagnostic mineral features are visible

Synthetic Sapphire and Ion-X Glass

Single-crystal Alumina (Al2O3) and Ion-strengthened Aluminosilicate Glass

Fossilized belemnite rostrum (likely)

Belemnitida, a fossil cephalopod guard; exact genus cannot be determined from the image

Milky quartz

Quartz, silicon dioxide (SiO₂)

Tumbled brecciated jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with pale quartz/chalcedony veins

Sandstone (lithic/quartz variant)

Clastic sedimentary rock (SiO2 predominant)

Sandstone

Arenite (SiO2 principal)

Quartzite Pebble

Quartzite (SiO2)

Diamond

C

Cobalt Blue Sea Glass

Amorphous Silica Glass (SiO2 + CoO)

Colorless tourmaline (probably elbaite)

Elbaite, Na(Li₁.₅Al₁.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)

Diamond

Carbon (C)

Textile (Upholstery Fabric)

Woven Polyethylene/Polyester or Cotton Blend

Tumbled yellow chalcedony (possibly citrine or pale agate)

Chalcedony, microcrystalline quartz (SiO₂); exact variety cannot be confirmed visually

Tumbled, iron-stained quartz-rich pebble

Likely quartz/chalcedony with iron-oxide staining; exact rock type cannot be determined from the image

Tumbled brown jasper (likely)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Sandstone Pebble

Arenite (Siliclastic sedimentary rock)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Sandstone

Arenite

Red Sandstone

Ferruginous Sandstone (SiO2 dominated with Fe2O3)

Red Sandstone

Sandstone (lithic arenite or arkose with iron oxide)

Pebble

Lithic fragment / Water-worn rock

Sandstone

Arenite (SiO2 principal composition)