Mineral With Artificial Coating

Fossilized tooth, likely mammalian molar

Silicified or mineral-replaced mammalian tooth; exact taxon cannot be determined from the image

Dyed Agate

SiO2

Polished malachite

Malachite, Cu₂CO₃(OH)₂

Dyed Agate Slice

Silicon Dioxide (SiO2) with artificial colorants

Likely smoky quartz pendant

Smoky quartz, silicon dioxide (SiO₂), quartz variety colored by irradiation-related defects

Red Sandstone (Siltstone Pebble)

Arenite / Siltstone with Iron Oxide (Fe2O3)

Psilomelane (Manganese Ore)

Psilomelane (Ba,H2O)2Mn5O10

Blue Crackle Quartz (Dyed Fire Agate/Quartz)

Silicon Dioxide (SiO2) with artificial dye treatment

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Tumbled orbicular granite

Orbicular granite, composed mainly of quartz, feldspar, and mica/amphibole

Amethyst druzy geode slice

Quartz, SiO₂, purple variety (amethyst), with likely chalcedony/banded agate

Dalmation Stone (Dyed)

Peralkaline rhyolite

Blue Howlite

Dyed Howlite (Ca2B5SiO9(OH)5)

Green sea glass (likely bottle glass)

Man-made soda-lime silicate glass; not a natural mineral

Prasiolite

Silicon Dioxide (SiO2) with iron impurities

Clear Quartz with Limonite

Silicon Dioxide (SiO2) with Hydrated Iron Oxides

Tumbled Quartz

Silicon Dioxide (SiO2)

Limonite on Sandstone

Iron Oxyhydroxide (FeO(OH)·nH2O) on Quartz Sandstone

Amethyst druzy quartz

Quartz, SiO₂; purple variety colored mainly by iron-related defects

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Unidentified polished mineral fragment

Likely quartz-bearing stone; exact identification is impossible from the blurred photograph

Druzy Quartz Geode (Vug)

Silicon Dioxide (SiO2)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Druzy Quartz on Matrix

Silicon Dioxide (SiO2)

Pink Dyed Agate (Banded Chalcedony)

Silicon dioxide (SiO2) - variety Chalcedony

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Dyed Agate

Agate (Silicon Dioxide, SiO2)

Dyed Tumbled Quartz

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2)

Quartz (Citrine variety)

Silicon Dioxide (SiO2)

Sandstone with Manganese Oxide Patina

Clastic Sedimentary Rock (primarily SiO2)

Iron-rich mineral fragment, possibly limonite/goethite

Limonite (hydrated iron oxides; commonly goethite, FeO(OH), with hematite)

Dyed Agate

SiO2 (Silicon Dioxide)

Lemon Quartz (Orizaba/Citrinated Quartz)

Silicon Dioxide (SiO2) with iron impurities/treatment

Green iridescent glass cabochon or synthetic gemstone

Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone

Limonite (Iron Ore)

Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)

Likely polished blue-green gemstone

Indeterminate from image; possibilities include sapphire (corundum, Al₂O₃), aquamarine (beryl, Be₃Al₂Si₆O₁₈), or blue-green tourmaline

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

Dyed Howlite (simulating Lavender/Purple Jade or Charoite)

Howlite: Ca2B5SiO9(OH)5 (when natural)

Quartz geode with drusy quartz crystals

Quartz, silicon dioxide (SiO₂), commonly colorless to milky crystalline quartz

Quartz River Pebble (Iron-Stained)

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions