Sedimentary (Artificial)

Dyed and polished agate pebble

Microcrystalline quartz (SiO₂), likely chalcedony/agate with blue dye

Iridescent coated quartz (likely synthetic/display gemstone)

Quartz, silicon dioxide (SiO₂), likely faceted and surface-coated; exact material cannot be confirmed visually

Tumbled orange chalcedony or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2)

Ruby Lavender Quartz with Amethyst

Silicon dioxide with neodymium dopant (SiO2)

Smoky Quartz

Smoky Quartz (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Dyed Agate (Tumbled)

Silicon Dioxide (Chalcedony variety, artificially dyed)

Heat-Treated Citrine (Amethyst-based)

Quartz (Silicon Dioxide) - SiO2

Basalt (Polished River Stone)

Basalt (Extrusive Mafic Volcanic Rock)

Native bismuth

Bismuth (Bi), commonly artificially crystallized

Blue dyed mineral or stone fragment (identity uncertain)

Not reliably identifiable from the image; possibly dyed quartz or another porous stone

Tumbled quartz bead bracelet

Quartz (SiO₂), likely milky or rose quartz

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Dyed Agate Slice

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Crackled Quartz (Dyed)

Silicon Dioxide (SiO2)

Dragon Vein Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Iridescent bismuth crystal

Bismuth (Bi), commonly laboratory-grown and oxidized

Dyed and polished agate slice

Agate, a banded microcrystalline variety of chalcedony (SiO₂), commonly quartz with minor impurities

Polished breccia-like rock specimen

Likely polymictic breccia or brecciated jasper, with quartz-rich fragments

Dyed red crystal aggregate, likely quartz or salt

Uncertain; possibly dyed quartz (SiO₂) or halite (NaCl)

Obsidian (likely blue-sheen or coated obsidian)

Volcanic glass; primarily rhyolitic silica glass (SiO₂-rich, noncrystalline)

Blue Topaz

Al2SiO4(F,OH)2

Red Tiger's Eye

Silicon Dioxide (SiO2) with hematite inclusions

Clear Quartz Sphere

Crystalline Silicon Dioxide (SiO2)

Dyed Pink Quartzite Beads

Recrystallized Silicon Dioxide (SiO2) with dye

Pink Tumbled Agate

Silicon Dioxide (SiO2) with dye

Cream Marble (Speckled)

Metamorphosed Limestone (mainly CaCO3)

Purple Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

White quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Crackle Agate / Dyed Agate

Agate (Silicon dioxide / SiO2)

Blue slag-like mineral specimen, possibly bornite or chalcopyrite

Tentatively bornite (Cu5FeS4) or iridescent chalcopyrite (CuFeS2)

Peridot

Olivine ((Mg, Fe)2SiO4)

Peridot (Olivine)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Blue-green peacock chalcopyrite

Chalcopyrite, CuFeS₂, artificially oxidized/iridescent-coated

Polished chrysoprase (likely dyed or treated)

Chalcedony, cryptocrystalline quartz (SiO₂), colored green by nickel

Quartzite

Quartzite (mostly SiO2)

Likely chalcopyrite-bearing sulfide ore

Chalcopyrite (CuFeS₂), possibly with pyrite and/or sphalerite

Agate

Banded Chalcedony (SiO2)

Vesicular basalt

Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine

Pink granite or rhyolite cobble

Felsic igneous rock, likely weathered granite; mainly quartz, feldspar, and minor biotite/amphibole

Dyed Agate

Cryptocrystalline variety of Silica (SiO2)