Man Made (Synthetic Rock)

Granite

Granite (Felsic Plutonic Rock)

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material

Tumbled dalmatian jasper (likely)

Microcrystalline quartz/chalcedony with black amphibole or aegirine inclusions; commonly sold as “dalmatian jasper”

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Diamond-set gold ring

Diamond (crystalline carbon, C) set in a gold alloy; the metal and setting are manufactured

Green faceted or cabochon gemstone (possibly glass or synthetic)

Undetermined; possibilities include green beryl (Be₃Al₂Si₆O₁₈), quartz (SiO₂), or synthetic glass

Gemstone rings (stones not reliably identifiable)

The pale stone may be quartz or another translucent gem; the red stone may be ruby, garnet, or synthetic corundum. Image detail is insufficient for identification.

Tumbled turquoise-like stone

Likely turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Porphyry

Porphyritic Igneous Rock

Blue Sapphire

Corundum (Al2O3)

Chert (Flint)

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartz Rock (SiO2)

Quartzite

Metamorphic quartz rock (SiO2)

Quartzite

Metamorphic Quartz Rock (SiO2)

Chert

Silicon dioxide (SiO2)

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Red gemstone ring, likely ruby or synthetic ruby

Corundum (Al₂O₃), chromium-colored; the image alone cannot confirm whether it is natural or synthetic

Blue cabochon gemstone ring

Uncertain; likely blue sapphire (corundum, Al₂O₃), blue topaz, or synthetic glass/spinel

Eroded Brick or Pumice-like Scoria

Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)

Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartzite

Metamorphic Quartzite (SiO2)

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Likely bismuth crystal

Synthetic bismuth (Bi), crystallized from molten metal; not a natural rock-forming specimen

Tumbled yellow-brown chalcedony (likely agate)

Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained agate

Smoky Quartz

Silicon Dioxide (SiO2)

Red faceted gemstone, likely synthetic ruby

Corundum (Al₂O₃); ruby is red chromium-bearing corundum

Ruby ring

Corundum (Al₂O₃), red variety colored mainly by chromium

Likely flint (dark chert)

Microcrystalline quartz (SiO₂), commonly called chert or flint

Quartzite pebble

Quartzite (SiO2)

Likely milky quartz fragment

Quartz (SiO₂)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Turquoise

Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Sandstone

Arenite (SiO2 composition dominant)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Slag (Industrial Glass/Metal)

Ferrous slag or Glassy silicate byproduct

Colorless faceted gemstone, likely quartz

Quartz (SiO₂), probably rock crystal; exact identification is uncertain from the strongly backlit image

Tumbled chalcedony pendant (likely agate)

Chalcedony, microcrystalline quartz (SiO₂); the pale bands suggest agate

Possible basalt or iron-rich slag

Basalt (tentative; identification uncertain from image)

Unidentified gray stone/concrete-like fragment

Indeterminate; likely a fine-grained carbonate or cementitious geological fragment