Man Made Byproduct (Non Geological)

Sandstone Concretion

Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)

Iron Slag

Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)

Slag (Anthropogenic Glass/Iron byproduct)

Ferro-silicate Slag

Carved yellow stone butterfly

Undetermined; possibly carved soapstone (talc-rich rock) or another soft ornamental stone

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Sandstone Concretion

Sedimentary Clastic Rock (Silicate-rich)

Green glass-like mineral specimen, likely fluorite

Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass

Note on Image Identification: Textile

N/A (Anthropogenic material)

Unidentified translucent crystal/mineral fragment

Likely quartz (SiO₂), but visual identification is uncertain

Diamond (or Simulant)

Carbon (C)

Opalite

Synthetic Opalized Glass (SiO2 + additives)

Man-made earbud charging case (Not a rock or mineral)

Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Likely clear quartz pebble or glassy quartz fragment

Quartz (silicon dioxide, SiO₂)

Beads (likely glass or man-made material)

N/A (artificial material)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Concretion

Sedimentary Concretion (Ironstone / Calcite Concretion)

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Man-made Carved Stone (Scream Mask/Skull motif)

Carved Soapstone or Serpentine-rich rock

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Dyed Agate / Painted Stone

Silicon Dioxide (SiO2) with artificial pigment

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Metal Alloy (Likely Pewter or Sterling Silver)

Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).

Carborundum (Silicon Carbide)

Silicon carbide (SiC)

Slag (Industrial Glass/Metal)

Ferrous slag or Glassy silicate byproduct

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Slag Glass

Amorphous Silica Glass (with metal oxide inclusions)

Rounded graywacke or sandstone cobble

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

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Weathered iron-rich concretion or ironstone nodule

Goethite–hematite limonite concretion (FeO(OH), Fe₂O₃, and hydrated iron oxides)

Mohave Turquoise (Composite/Stabilized)

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

Opalite

Synthetic Opalite Glass

Chert (Arrowheads)

Microcrystalline Quartz (SiO2)

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Concrete with Exposed Aggregate

Anthropogenic conglomerate (Concrete)

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Opalite crescent pendant

Opalite (man-made opalescent glass; not a natural mineral)

Decorative mosaic cross containing mixed rock and glass fragments

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

Opalite

Synthetic Silicon Dioxide (SiO2)

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives