Man Made Glass (Not A Natural Rock Or Mineral)

Man-made Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating/dye

Slag

Glassy silicate byproduct (anthropogenic material)

Polished obsidian

Volcanic glass; predominantly rhyolitic SiO₂

Tumbled gray stone, likely quartz-rich pebble

Probable microcrystalline quartz/chalcedony (SiO₂), possibly gray jasper or quartzite

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Polished stone sphere, possibly agate or jasper

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

Sandstone-based Concrete Fragment

Cementitious Composite with Sedimentary Aggregate

Lava Rock with Fabric Impression

Scoria or Basalt with anthropogenic impressions

Black-and-white agate geode pendant

Agate (microcrystalline quartz, SiO₂), likely a hollow geode slice with chalcedony and drusy quartz

Sandstone

Arenite (SiO2 primarily)

Rounded quartz pebble

Quartz (silicon dioxide, SiO₂)

Rounded graywacke or sandstone cobble

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

Small greenish crystal/mineral fragment

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

Sandstone

Arenite (variable SiO2 composition)

Red glassy cabochon, likely synthetic ruby or red glass

Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass

Sandstone (likely Quartzose Sandstone)

Arenite

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Slag

Anthropogenic glassy silicate

Sea Glass

Amorphous silicon dioxide (Man-made glass weathered by nature)

Bouncy Ball (Synthetic Rubber Polymer)

Polybutadiene / Ethylene Vinyl Acetate (EVA)

Decorative gemstone-chip jewelry (likely turquoise, coral, and assorted beads)

Predominantly turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; other pieces appear to be dyed coral or red stone, and possibly shell/metal components

Polished labradorite sphere

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

Green Sea Glass

Amorphous Silica (man-made glass), SiO2 + additive metal oxides

Sea Glass

Man-made silicate glass weathering product

Blue Goldstone

Synthetic glass with cobalt and copper inclusions

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Milky quartz (likely quartz crystal fragment)

Quartz, silicon dioxide (SiO₂)

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

Faceted glass-like gemstone object

Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image

Sandstone Concretion

Limonitic Sandstone Concretion

Polished labradorite pendant

Labradorite, a calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Stainless Steel (Polished)

Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)

Asphalt Chunk

Asphalt concrete

Dyed Agate / Painted Stone

Silicon Dioxide (SiO2) with artificial pigment

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)

Yellow cabochon gemstone, likely citrine or yellow glass imitation

Quartz (SiO₂), if natural citrine; visual evidence is insufficient to exclude man-made glass or resin

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

Hematite Beads

Hematite (Fe2O3)

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)

Fluorite (Polished Point/Tower)

Calcium Fluoride (CaF2)

Blue Crackle Quartz (Dyed Quarzite)

Silicon Dioxide (SiO2) with artificial dye