Man Made Material, Not A Natural Rock Or Mineral Specimen

Red heart-shaped glass bead in a wire-wrapped jewelry charm

Likely colored glass (amorphous silica-based material); the image does not show an identifiable geological specimen

Concretion

Sedimentary Concretion (Ironstone / Calcite Concretion)

Small stone fragments

Undetermined; the image does not show enough detail for a reliable identification

Tumbled greenstone / serpentinite (probable)

Serpentinite, chiefly Mg-rich serpentine minerals (antigorite, lizardite, chrysotile), possibly mixed with chlorite, magnetite, or carbonate

Tumbled sea glass or pale-green quartz pebble

Indeterminate from image; possibly quartz (SiO₂), but the smooth translucent piece may be man-made glass

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Cubic Zirconia (Man-made)

Cubic Zirconia (ZrO2) with Enamel and Metal Alloy

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Libyan Desert Glass

Libyan Desert Glass (SiO2 with trace elements)

Sandstone

Arenite

Opalite

Synthetic glass (SiO2 + metal additions)

Sandstone

Arenite (with iron oxide cement)

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Acrylic or Resin (Synthetic Imitation)

Polymethyl Methacrylate (PMMA) or Polyepoxide

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

Silicon Dioxide (SiO2) with artificial coloration

White quartz pebble or chip

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Opalite

Synthetic Glass (Simulated Moonstone/Opal)

Yellow faceted gemstone, likely citrine or synthetic glass

Citrine (quartz, SiO₂) is the leading natural possibility; visual identification is uncertain from the photograph

Unidentified translucent crystal/mineral fragment

Likely quartz (SiO₂), but visual identification is uncertain

Sandstone Pebble

Ferruginous Sandstone (SiO2 with Fe2O3)

Likely gold-colored metal ring with a possible gemstone

Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting

Asphalt (Bituminous Concrete)

Bituminous Concrete / Pavement

Rounded pink granite cobble

Granite, chiefly quartz–alkali feldspar–plagioclase–biotite

Weathered iron-rich concretion or ironstone nodule

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

Blue-dyed tumbled quartz or glass imitation

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

Polished, carved gemstone (possibly dyed agate or glass-like material)

Unconfirmed from the image; no specific mineral can be identified reliably

Possible yellow agate or chalcedony bead

Microcrystalline quartz (SiO₂), likely chalcedony; identification is uncertain from the photo

Likely weathered iron-rich rock or slag fragment

Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)

Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)

Silicified limestone or banded sedimentary rock with mineral veins

Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Flint (gray chert)

Microcrystalline quartz (SiO₂), a variety of chert

Blue-green rough mineral specimen (identity uncertain)

Undetermined; the image is insufficient for a reliable mineral identification

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Clear gemstone earring (likely cubic zirconia)

Cubic zirconia (synthetic zirconium dioxide, ZrO₂); identification from the image is uncertain

Chert (Honey Chert / Flint)

Silicon Dioxide (SiO2)

Polished labradorite sphere

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

Chalk

Calcium carbonate (CaCO3)

Goldstone (Red)

Aventurine Glass

Sandstone (likely Fossiliferous)

Arenite / Fossiliferous Sandstone (SiO2 composition)

Slag Glass (Leland Blue variant)

Anthropogenic Vitreous Silicate

Vesicular basalt (likely scoria)

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