Man Made Rock (Technosol)

Tumbled ruby-in-zoisite (likely)

Ruby-bearing zoisite; zoisite Ca₂Al₃(SiO₄)₃(OH), corundum ruby Al₂O₃

Flint or chert, possibly a knapped stone tool

Microcrystalline quartz (SiO₂), commonly chalcedony with possible carbonaceous impurities

Chalk

Micrite (primarily Calcium Carbonate, CaCO3)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Diamond in Kimberlite

Diamond (C in Kimberlite Matrix)

Slag

Ferrous Slag (Siliceous industrial waste)

Conglomeratic concrete or asphalt aggregate surface with dark bituminous chunks

Polymictic gravel aggregate; dark pieces likely bitumen/asphalt, not a natural rock

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Diamond (in Jewelry Setting)

Carbon (C)

Dark, weathered stone—possibly basalt or slag

Indeterminate; likely fine-grained basalt (plagioclase–pyroxene)

Lapis lazuli and green-blue chalcedony jewelry

Lapis lazuli: lazurite-bearing metamorphic rock, chiefly lazurite (Na₃Ca(Al₃Si₃O₁₂)S) with calcite and pyrite; second stone: likely chrysoprase or green-blue chalcedony (microcrystalline quartz, SiO₂)

Botryoidal chalcedony with quartz vug

Microcrystalline quartz, SiO₂ (chalcedony), with a drusy quartz-lined cavity

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Cardstock (Paper)

Cellulose (C6H10O5)n

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Slag (Anthropogenic Glass/Iron byproduct)

Ferro-silicate Slag

Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)

Silicon Dioxide (SiO2) with metallic inclusions

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Vesicular basalt (likely scoria)

Basaltic scoria; predominantly plagioclase, pyroxene, and olivine in a mafic volcanic glass/microcrystalline matrix

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Blue chalcedony cabochon (probable)

Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂

Diorite

Phaneritic Intrusive Igneous Rock (composed of Plagioclase feldspar, Hornblende, and Biotite)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Chert (Jasper / Quartz pebble)

Microcrystalline Quartz (SiO2)

Chert (Chocolate or Brown Flint)

Chert (SiO2)

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Yellow Sapphire (Raw)

Corundum (Al2O3)

Dyed Blue Agate Slice

Silicon Dioxide (SiO2)

Industrial Slag

Anthropogenic Vitreous Slag

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2 + Fe2O3)

Chert / River Pebble

Microcrystalline Quartz (SiO2)

Sea Glass

Amorphous Silicon Dioxide (SiO2)

Crackle Glass (Simulated Gemstone)

Amorphous Solid (SiO2)

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Blue Goldstone

Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)

Porcelain (Stoneware Ceramic)

Mullite / Silica-glass composite (Al6Si2O13)

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Goldstone (Brown)

Aventurine glass