Sedimentary (If Natural Jasper) Or Artificial (If Slag)

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Dyed Agate (Tumbled)

Silicon Dioxide (Chalcedony variety, artificially dyed)

Heated Citrine (Heat-Treated Amethyst)

Silicon Dioxide (SiO2), quartz variety

Red jasper / iron-rich chert

Microcrystalline quartz (SiO₂) colored by hematite/goethite

Clear quartz crystal point

Quartz (silicon dioxide, SiO₂), likely a polished or cut crystal

Blue Crackle Quartz (Dyed Fire Agate/Quartz)

Silicon Dioxide (SiO2) with artificial dye treatment

Native American Hammerstone / Pitted Stone

Modified lithic artifact (often quartzite, basalt, or granite)

Jasper

Silicon Dioxide (SiO2) microcrystalline quartz

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

Blue Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Jasper and Chalcedony Nodule

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Concrete

Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)

Peacock Ore

Bornite (Cu5FeS4)

Dyed Crackle Quartz (Green)

Quenching-treated Quartz (Silicon Dioxide, SiO2)

Dyed Purple Agate

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Dragon Vein Agate (Dyed/Fractured Quartz)

Silicon dioxide (SiO2)

Dyed Agate Geode

Silicon Dioxide (SiO2) with artificial pigment

Heat-Treated Citrine (Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Dyed Blue Agate

Chalcedony (Silicon Dioxide / SiO2)

Dyed Agate

Chalcedony (Silicon Dioxide, SiO2)

Blue Crackle Quartz (Dyed Quarzite)

Silicon Dioxide (SiO2) with artificial dye

Dalmatian Stone (Dalmation Jasper)

Aplite with Arfvedsonite inclusions

Citrine (Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Dyed Agate Slice

Chalcedony (Silicon Dioxide, SiO2) with artificial pigment

Dark fine-grained rock, likely basalt

Basalt; chiefly plagioclase feldspar and pyroxene, commonly with olivine and iron oxides

Jasper

Microcrystalline Quartz (SiO2)

Blue Dyed Agate Geode

Chalcedony (cryptocrystalline Quartz), SiO2

Smoky Quartz

Silicon Dioxide (SiO2)

Dyed Tumbled Quartz (Dragon's Vein Agate/Quartz)

Silicon Dioxide (SiO2) with artificial dye

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Small tumbled dark stone, possibly basalt or slag

Likely fine-grained basalt; exact identification is uncertain from the photograph

Dyed Tumbled Quartz

Silicon Dioxide (SiO2)

Possible iron-rich chert or slag-like rock

Microcrystalline quartz (SiO₂), possibly iron-stained chert; exact identification is uncertain from the image

Polished dark stone, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine

Orange chalcedony or weathered quartz pebble

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

Tektite (specifically Indochinite)

Tektite (Natural silica glass)

Crackled Quartz (Dyed)

Silicon Dioxide (SiO2)

Dyed or color-enhanced agate/microcrystalline quartz bead

Chalcedony (microcrystalline SiO₂), likely agate

Asphalt Concrete

Bituminous Concrete (Anthropic Rock)