Man Made Byproduct (Non Geological)

Flint (gray chert)

Microcrystalline quartz (SiO₂), a variety of chert

Likely chert (flint)

Microcrystalline quartz (SiO₂), likely chert; exact identification is uncertain from the image alone

Red cabochon gemstone ring (likely ruby or red spinel; identity unconfirmed)

Possibly corundum (ruby, Al₂O₃) or spinel (MgAl₂O₄); visual identification alone cannot distinguish these from glass or synthetic stones.

Granite

Granite (Plutonic Igneous Rock)

Terrazzo (with Marble and Granite fragments)

Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates

Red coral (likely precious coral)

Corallium sp.; calcium-carbonate skeleton, primarily calcite

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various metal oxide impurities

Faceted brown gemstone pendant, likely smoky quartz or champagne topaz

Probably quartz (SiO₂), smoky variety; alternatively topaz (Al₂SiO₄(F,OH)₂)

Polished hematite (specimen identification uncertain)

Hematite, α-Fe₂O₃

Likely flint (chert) fragment

Chert, microcrystalline quartz (SiO₂)

Diamond ring

Diamond, crystalline carbon (C)

Blue glassy mineral fragment, possibly sodalite or dyed/cobalt glass

Uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) if natural, but vivid blue color may indicate cobalt-colored glass

Exposed aggregate concrete (stone-chip surface)

Portland-cement concrete containing natural aggregate; not a natural rock

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Chalk

Carbonate rock (mainly CaCO3)

Green cabochon gemstone, likely aventurine or dyed chalcedony

Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Diamond (in a cluster setting)

Crystallized Carbon (C)

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Polished stone sphere, possibly agate or jasper

Likely microcrystalline quartz (SiO₂); exact variety cannot be confirmed from the image

Weathered dark mineral/rock fragment

Indeterminate; possibly iron-rich basalt, slag, or a sulfide-bearing mineral

Red/pink tumbled mineral fragment

Indeterminate; possibly dyed quartz, ruby/corundum, or red glass-like chalcedony

Asphalt aggregate (crushed stone in bitumen)

Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen

Blue chalcedony cabochon (likely)

Chalcedony, microcrystalline SiO₂; possibly blue agate or common opal, which cannot be distinguished confidently from the image

Sandstone

Sedimentary Rock (Quartz arenite)

Tumbled blue chalcedony (possibly blue agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Tumbled quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Green Aura Quartz

Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)

Likely iron-rich rock or weathered metallic mineral fragment

Uncertain; possibly limonite/goethite or iron-bearing slag

Dark gray rounded stone, possibly basalt or slag

Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or iron-rich industrial slag

Diamond (Faceted)

Carbon (C)

Mixed polished gemstone and mineral collection

Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces

N/A - Image is non-geological

Acrylonitrile Butadiene Styrene (ABS) or Polypropylene (PP)

Build-A-Bear Plush (Non-Geological)

Polyester fibers (C10H8O4)n and Synthetic Polymers

White drusy quartz

Quartz, silicon dioxide (SiO₂), with a drusy coating of tiny crystals

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Small metallic-looking mineral/rock fragment

Indeterminate from image; possibly galena, hematite, or metallic slag

Small dark rock fragment

Uncertain; possibly weathered basalt or slag

Brown chert (flint)

Microcrystalline quartz (SiO₂), varieties called chert or flint

Quartz pebble or seed/crumb

SiO2 (if quartz)

Blue glassy cabochon, likely blue quartz or synthetic glass

Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive

Pyrite

Iron Sulfide (FeS2)