Sedimentary (Artificial)

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Dyed Blue Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Agate (Dyed Purple)

Agate (Variety of Chalcedony/Quartz), SiO2

Iridescent bismuth crystal

Bismuth (Bi), artificially crystallized

Bismuth crystal

Bismuth (Bi), artificially crystallized

Dyed Blue Agate Druzy Pendant

Quartz / Chalcedony (SiO2) with artificial color treatment

Rainbow Quartz (Dyed/Coated Quartz)

Silicon Dioxide (SiO2) with artificial color enhancement

Dyed Pink Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial dye additives

Rainbow Hematite (Titanium-Coated Hematite)

Titanium-treated Hematite (Fe2O3)

Tumbled yellow calcite

Calcite (CaCO₃), likely honey/yellow calcite

Green obsidian (likely molded or heat-treated glass-like specimen)

Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)

Banded Slag Glass (Leland Blue/Frankfort Green style)

Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)

Blue Lace Agate

Chalcedony (SiO2) with trace impurities

Likely black beach pebble

Undetermined; possibly basalt, chert, or dark slate

Lemon Quartz

Silicon Dioxide (SiO2)

Aura Agate

Silicon Dioxide with metal coating (SiO2)

Uncertain fine-grained rock or mineral-bearing specimen

Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains

Druzy chalcedony pendant, likely coated or dyed

Microcrystalline quartz (SiO₂), chalcedony with druzy quartz; surface may have titanium or metallic coating

Agate (Dyed High-Grade Polished Slice)

Silicon dioxide (SiO2), Chalcedony crystal variety

Dyed Agate (Dragon Vein Agate Bead)

Silicon dioxide (SiO2) variety Chalcedony

Dyed Pink Quartzite

Tumbled and Dyed Quartzite (SiO2 with dye treatment)

Clear Quartz (Milky Quartz pebble)

Silicon Dioxide (SiO2)

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

Dyed Blue Agate

Chalcedony (Silicon Dioxide / SiO2)

Blue Quartzite (Dyed Quartzite)

Silicon Dioxide (SiO2) with dye

Iridescent red crystal cluster, likely aura-coated quartz

Quartz (SiO₂), possibly metal-coated; exact identification is uncertain from the photo

Dyed Tumbled Quartz

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2)

Quartz (Citrine variety)

Silicon Dioxide (SiO2)

Prasiolite

Silicon Dioxide (SiO2) with iron impurities

Dyed Agate

SiO2

Polished carnelian (likely)

Carnelian, orange-red chalcedony; microcrystalline quartz (SiO₂)

Dyed Agate Geode (Pink/Magenta)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Mixed mineral specimens, prominently chalcopyrite and amethyst

Chalcopyrite (CuFeS₂) with secondary copper minerals; amethyst, purple quartz (SiO₂)

Tumbled chalcedony or quartz pebble

Microcrystalline quartz, SiO₂ (likely chalcedony); exact identification is uncertain from the image

Dyed Agate

SiO2 (Silicon Dioxide)

Lemon Quartz (Orizaba/Citrinated Quartz)

Silicon Dioxide (SiO2) with iron impurities/treatment

Carnelian (a variety of Chalcedony)

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Dyed Quartzite (Pink/Magenta)

Silicon Dioxide (SiO2) - Artificially Colored Quartzite

Dalmatian Stone

Peralkaline Feldsphathic Igneous Rock

Likely tumbled jasper or agate

Microcrystalline quartz (SiO₂), possibly iron-rich jasper

Turquoise

CuAl6(PO4)4(OH)8·4H2O