Sedimentary (Artificial)

Blue Lace Agate

Chalcedony (SiO2) with trace impurities

Bismuth crystal

Bismuth (Bi), artificially crystallized

Dalmatian Stone

Peralkaline Feldsphathic Igneous Rock

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 (Silicon Dioxide)

Lemon Quartz (Orizaba/Citrinated Quartz)

Silicon Dioxide (SiO2) with iron impurities/treatment

Polished blue lace agate slice

Chalcedony (microcrystalline quartz), SiO₂, commonly with blue-gray banding and a druzy quartz center

Pink Banded Agate (Dyed)

Chalcedony (cryptocrystalline silica), chemical formula SiO2

Red sandstone pebble

Quartz-rich sandstone, commonly ferruginous sandstone (SiO₂-dominated)

Aura Quartz (Coated Quartz)

Silicon Dioxide (SiO2) treated with metallic vapor

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

Dyed Quartzite (Pink/Magenta)

Silicon Dioxide (SiO2) - Artificially Colored Quartzite

Dyed Agate Geode (Pink/Magenta)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Dyed Agate

SiO2 (Silicon Dioxide)

Likely tumbled jasper or agate

Microcrystalline quartz (SiO₂), possibly iron-rich jasper

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Blue Lace Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Dyed mineral cluster, likely calcite or aragonite

Calcite (CaCO₃) or aragonite (CaCO₃), artificially color-enhanced

Blue aventurine quartz (likely dyed or tumbled quartzite)

Quartz, silicon dioxide (SiO₂), with blue coloration from inclusions or dye

Red chalcedony (likely dyed or heat-treated)

Microcrystalline quartz, SiO₂; possibly red agate/carnelian

Red Tiger's Eye

Pseudomorph of Macrocrystalline Quartz after Crocidolite (SiO2)

Vesicular volcanic scoria (likely weathered basaltic scoria)

Scoria; chiefly vesicular basalt, composed mainly of plagioclase, pyroxene, and iron-rich glass

Hag Stone (Quartz Pebble with Natural Hole)

Quartz (Silicon Dioxide - SiO2)

Polished blue obsidian with a pale mineral crust

Obsidian (volcanic glass), likely coated or encrusted with quartz/calcite

Aura Quartz Geode (Angel Aura Quartz)

Silicon Dioxide (SiO2) bonded with precious metals

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Yellow quartz-bearing rock, possibly sulfur-stained quartz or calcite

Indeterminate; likely quartz (SiO₂) and/or calcite (CaCO₃) with yellow iron/sulfur staining

Polished black stone, possibly basalt or black obsidian

Likely fine-grained basalt (plagioclase and pyroxene) or volcanic glass (obsidian; rhyolitic composition)

Blue Topaz

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2]

Dyed Alum or Dyed Quartz (Ornamental Crystal)

Silicon Dioxide (SiO2) or Potassium Alum [KAl(SO4)2·12H2O]

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Dyed tumbled quartz (likely quartzite or quartz crystal)

Quartz, silicon dioxide (SiO₂)

Dyed tumbled stone, likely chalcedony or quartz

Microcrystalline quartz (SiO₂), probably dyed magenta

Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate / Chalcedony

Native American Hammerstone / Pitted Stone

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

Blue Quartzite (Dyed Quartzite)

Quartzite (SiO2 with dye enhancements)

Painted River Rock (likely Quartzite or Granite)

Quartzite or Granitic Gneiss (painted)