Man Made (Synthetic Rock)

Granite

Phaneritic plutonic felsic rock

Faceted Gemstones (Mixed)

Various (e.g., Corundum, Beryl, Quartz, or synthetic equivalents)

Sandstone

Arenite (composed primarily of SiO2)

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Sandstone

Clastic Sedimentary Rock

Granite

Phaneritic Plutonic Felsic Rock

Granite

Granite (Phaneritic igneous rock)

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

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Granite

Intrusive Igneous Rock (Granitic)

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Fossil Coral

Scleractinia (Stony Coral) fossil

Sandstone

Arenite (mostly SiO2)

Tumbled turquoise-like stone

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

Quartzite

Metamorphic Quartz Rock (SiO2)

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation

SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)

Blue Sapphire

Corundum (Al2O3)

Sandstone

Clastic Sedimentary Rock

Sandstone

Arenite (composed primarily of SiO2)

Tumbled dalmatian jasper (likely)

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

Smoky Quartz

Silicon Dioxide (SiO2)

Granite

Felsic intrusive igneous rock

Chert (Flint / Quartz Nodule)

Microcrystalline Quartz (SiO2)

Blue cabochon gemstone ring

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

Red gemstone ring, likely ruby or synthetic ruby

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

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.

Turquoise

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

Sandstone

Arenite (SiO2 based clastic rock)

Sandstone Pebble

Ferruginous Sandstone (SiO2 with Fe2O3)

Quartzite

Metamorphic Rock (Mainly SiO2)

Ruby ring

Corundum (Al₂O₃), red variety colored mainly by chromium

Unidentified gray metallic object

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

Colorless faceted gemstone, likely glass or cubic zirconia

Uncertain; possible cubic zirconia (ZrO₂) or quartz (SiO₂), but the image may show a man-made simulant

Colorless faceted quartz-like gemstone

Likely quartz (SiO₂), though the appearance may also indicate man-made glass or cubic zirconia

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Eroded Brick or Pumice-like Scoria

Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Granite

Phaneritic Felsic Igneous Rock

Granite

Granite (Plutonic Igneous Rock)