Anthropogenic (Man Made Material Processed By Nature)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Cubic Zirconia (Man-made)

Cubic Zirconia (ZrO2) with Enamel and Metal Alloy

Opalite (Synthetic Opalized Glass)

Synthetic Silicon Dioxide (SiO2) glass

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Polished labradorite sphere

Labradorite, calcic plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)

Opalite

Synthetic Opalite Glass / Opalized Glass

Diamond / Clear Quartz / Glass paste

Carbon (Diamond) / Silicon Dioxide (Quartz)

Opalite (likely man-made opalescent glass)

Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)

Polished brown jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

Green glass cabochon or tumbled stone

Indeterminate; likely man-made glass, possibly aventurine glass rather than a natural mineral

Aura Quartz

Titanium/Titanium-Gold treated Silicon Dioxide (SiO2)

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Bismuth

Bismuth (Bi)

Asphalt (Bituminous Concrete)

Composite material (bitumen binder with mineral aggregate)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Shale (Ferruginous)

Laminated Mudrock (Siliciclastic Sedimentary Rock)

Blue-dyed tumbled quartz or glass imitation

Quartz (SiO₂), appearance possibly enhanced with blue dye; identity uncertain from image

Black glassy fragment, likely obsidian or industrial glass

Volcanic glass (obsidian), chiefly amorphous SiO₂; identification uncertain from image

Build-A-Bear Plush (Non-Geological)

Polyester fibers (C10H8O4)n and Synthetic Polymers

Decorative mosaic cross containing mixed rock and glass fragments

Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass

Goldstone

Aventurine Glass (SiO2 + Cu small inclusions)

Green sea glass (likely bottle glass)

Man-made soda-lime silicate glass; not a natural mineral

Faceted clear gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂); exact identification requires refractive-index and hardness tests

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Opalite

Synthetic Opalite Glass (Silicon Dioxide)

Goldstone

Aventurine Glass (Man-made glass with copper inclusions)

Rounded graywacke or sandstone cobble

Lithified clastic sandstone; likely quartz–feldspar–lithic grain aggregate in a silica or calcite matrix

Diamond

Carbon (C)

Polished black pebble, possibly obsidian

Volcanic glass (obsidian), likely; identification is tentative from the image

Carved quartz (likely rose quartz and green aventurine/quartz)

Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine

Small greenish crystal/mineral fragment

Indeterminate; possibly olivine, quartz, or a green gemstone fragment

Pink Tumbled Quartz (Dyed)

Silicon Dioxide (SiO2)

Coquina

Bioclastic Limestone

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Asphalt (Bituminous Concrete)

Bituminous mix / Anthropogenic conglomerate

Asphalt concrete

Anthropogenic conglomerate

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Sandstone Anvil / Nutting Stone

Quartzose Sandstone (Sedimentary Rock)

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Opalite

Synthetic Glass (Silica-based)