Not A Natural Rock

Beach Pebble (Basalt / Greywacke)

Basalt (or fine-grained Sedimentary Greywacke)

Chalcanthite (Likely Synthetic/Lab-Grown)

Hydrated copper(II) sulfate (CuSO4·5H2O)

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly a fragment of quartzite or silica-rich slag

Possible basalt or industrial iron-rich slag

Basalt (plagioclase–pyroxene rock); identification uncertain from image

Likely iron-rich slag or weathered ironstone

Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag

Slag (Industrial By-product)

Glassy silicate or metallic smelting residue

Diamond jewelry setting

Diamond (crystalline carbon, C) in a metal setting; the small stones’ identity is not visually confirmable

Colorless faceted gemstone (likely cubic zirconia)

Cubic zirconia, ZrO₂ (synthetic zirconium dioxide); possibly synthetic glass or lab-grown diamond

Mixed gemstone bead bracelet, likely lava rock and aventurine/jade-look beads

Basaltic scoria (vesicular basalt), plus probable serpentine, aventurine, or dyed quartzite beads

Dark, weathered stone—possibly basalt or slag

Indeterminate; likely fine-grained basalt (plagioclase–pyroxene)

River Stone (likely Siltstone or fine-grained Sandstone)

Clastic Sedimentary Rock (Lithic Wacke / Siltstone)

Biotite-bearing granite or gneiss

Felsic granitoid; chiefly quartz, feldspar, and biotite mica

River Stone (likely Quartzite or Chert)

Sedimentary rock composed of Silicon Dioxide (SiO2)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Slag Glass

Amorphous Silica Glass (with metal oxide inclusions)

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Decorative mosaic cross containing mixed rock and glass fragments

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

Slag

Anthropogenic Vitreous Silicate / Ferro-silicate Slag

Eroded Brick or Pumice-like Scoria

Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)

Grey River Pebble (Likely Quartz-rich or Limestone)

Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)

Green Glass Cullet / Recycled Glass

Amorphous Silicon Dioxide (SiO2) with various metal oxides

Small dark rock fragment (likely basalt or slag)

Tentatively basalt; exact identification is uncertain from the photograph

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Granite with Cupules / Bedrock Mortars

Granite (felsic intrusive plutonic rock)

Fossil fish specimen

Fossilized fish vertebrate, likely an articulated fish impression; exact taxon indeterminate

Beads (likely glass or man-made material)

N/A (artificial material)

Amethyst geode or druzy quartz specimen

Quartz, SiO₂; purple coloration is typically caused by iron-related defects and irradiation

Likely dyed or painted stone

Unidentified natural rock; vivid purple, orange, and pink coloration appears to be a surface coating or pigment, so the underlying rock cannot be reliably identified from the image.

Turquoise cabochon

Turquoise; hydrated copper–aluminum phosphate, approximately CuAl6(PO4)4(OH)8·4H2O (composition varies)

Pink Anthracite Coal (dyed)

Anthracite Coal (Artificially Colored)

Metallic Ornament / Jewelry

N/A - This is an artificial object, not a geological 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

Rounded brown pebble (rock type undetermined)

Unidentified, iron-stained lithic pebble; composition cannot be determined from the photograph

Tumbled honey-colored stone, possibly citrine or yellow chalcedony

Uncertain from the photograph; possible quartz (SiO₂), either citrine or chalcedony

Small gold-colored jewelry piece with clear stones

Likely a metal setting holding small faceted gemstones; the stones cannot be identified from the image.

Blue goldstone (man-made glass)

Copper-bearing aventurine glass; synthetic silicate glass

Painted beach pebble

Unidentified natural pebble; underlying lithology cannot be determined from the image

Mystic Topaz

Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)