Man Made Rock Like Material

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline-to-massive variety

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Dzi Bead (Etched Chalcedony)

Cryptocrystalline Quartz (SiO2) with chemical etching

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Asphalt Concrete (Bituminous Concrete)

Bituminous aggregate

Bouncy Ball (Synthetic Rubber Polymer)

Polybutadiene / Ethylene Vinyl Acetate (EVA)

Not a rock, mineral, or geological specimen

Polished opalite (likely man-made opalescent glass)

Opalite is a commercial name, not a mineral; typically opalescent glass, often soda-lime silicate glass

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

Iron-rich slag or ironstone; appearance is not diagnostic

Likely iron-oxide-rich material (hematite, Fe₂O₃, and/or magnetite, Fe₃O₄); possibly smelting slag

Blue crystal pendant (likely blue glass or synthetic crystal)

Not identifiable from the image; possibly synthetic quartz or glass, rather than a natural mineral

Red Sandstone or Brick Fragment

Arenite (if sandstone)

Concretion

Sedimentary Concretion (Ironstone / Calcite Concretion)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial byproduct)

Sea Glass

Silicon dioxide (mostly)

Dyed or synthetic turquoise-blue glass-like specimen

Likely man-made colored glass or resin; exact identification requires testing

Concrete with Exposed Aggregate

Anthropogenic conglomerate (Concrete)

Slag Glass

Amorphous Silicate (Man-made)

Sandstone Concretion

Clastic Sedimentary Concretion (SiO2 with Iron Oxide)

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Opalite (Synthetic Moonstone/Sea Opal)

Silicon Dioxide (SiO2) glass with metallic inclusions

Man-made Synthetic Material (Not a rock or mineral)

Polyester (Polyethylene terephthalate) / Faux Fur

Sea Glass

Man-made silicate glass

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Goldstone

Avventurina (Man-made Glass with Copper inclusions)

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Mohave Turquoise (Composite/Stabilized)

Hydrated copper aluminium phosphate (CuAl6(PO4)4(OH)8·4H2O) with stabilizing resin and metallic inclusions

Glass

Amorphous Silicon Dioxide (SiO2)

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Boxwork or Septarian Concretion

Septarian nodule / Boxwork weathering

Small pebble, likely limestone

Unidentified carbonate pebble, possibly micritic limestone (calcite, CaCO₃)

Goldstone (Brown/Gold)

Aventurine Glass (Man-made glass with Copper inclusions)

Blue-green cabochon, likely chalcedony or treated glass imitation

Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (Chert or Flint)

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Ferrous Slag

Iron/Steel Slag (Complex Calcium-Alumino-Silicates)

Concrete with Aggregate

Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)

Cherry Quartz with Rose Quartz

Crystalline Quartz (SiO2) with glass-based synthetic components

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates