Organic Gem Material (Botanical)

Polished agate or jasper cabochon

Microcrystalline quartz (chalcedony), chiefly SiO₂; exact variety is uncertain from the image

Raw amethyst quartz

Amethyst, purple variety of quartz (SiO₂)

Chert (Flint Nodule)

Microcrystalline quartz (SiO2)

Banded Jasper

Silicate Mineral (Microcrystalline Quartz / SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Chert / Jasper

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2) with impurities

Jasper

Microcrystalline quartz (SiO2)

Shungite

Non-crystalline carbon (allotrope of carbon)

Olivine Weathered Rock (Dunite)

Dunite ((Mg, Fe)2SiO4)

Pink amethyst or pale pink quartz gemstone

Quartz, SiO₂; pink coloration may result from microscopic inclusions or irradiation-related defects

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Tumbled cream chalcedony or quartz

Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony

Honey-colored quartz crystal

Quartz (silicon dioxide, SiO₂), likely citrine or iron-stained quartz

Pearls (likely freshwater cultured pearls)

Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin

Mica-rich metamorphic rock fragments

Biotite schist / mica schist (predominantly biotite, muscovite, and quartz)

Quartz-rich stone, possibly aventurine quartz or quartzite

Quartz (SiO₂), likely massive or microcrystalline; exact identification requires testing

Fossilized Shark Tooth (Partial) or Coprolite

Elasmobranchii (fossil) or Coprolite (trace fossil)

Graphite

Graphite (Carbon, C)

Jasper

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Shark Tooth Fossil

Carcharocles megalodon or similar extinct shark tooth

Jasper

Microcrystalline quartz (SiO2)

Nacre (Mother of Pearl)

Nacre (Biogenic Aragonite/Calcite composite, CaCO3)

Milky quartz pebble

Quartz, silicon dioxide (SiO₂), cryptocrystalline-to-coarse crystalline aggregate

Amber (Green variation)

Succinite

Bicolored tourmaline (likely watermelon-type elbaite)

Elbaite tourmaline, complex borosilicate: Na(Li,Al)3Al6(BO3)3Si6O18(O,OH)4

Tumbled green jasper or serpentine

Likely serpentine-group mineral, chiefly magnesium silicate; possibly epidotized or altered jasper

Polished watermelon tourmaline

Elbaite tourmaline, Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Green aventurine (likely)

Quartz, SiO₂, with green fuchsite or other mica inclusions; identification from the image is uncertain

Likely green aventurine or serpentine fragment

Quartzite with fuchsite inclusions (aventurine), or serpentine-group mineral; exact identification requires testing

Rose quartz

Quartz, silicon dioxide (SiO₂), pink variety

Jadeite

Jadeite (NaAlSi2O6)

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

White quartz-rich rock, likely quartzite or milky quartz fragment

Quartzite; predominantly quartz (SiO₂), possibly with minor feldspar or mica

Polished tiger’s-eye pebble

Quartz (SiO₂), chatoyant fibrous variety; commonly partly altered crocidolite

Smoky Quartz

Silicon Dioxide (SiO2)

Petrified Wood

Silicified wood (primarily SiO2 - Silicon Dioxide)

Tumbled citrine quartz (probable heat-treated amethyst)

Quartz, silicon dioxide (SiO₂), likely iron-colored citrine

Blue glassy mineral fragment, likely kyanite or blue corundum

Tentatively kyanite (Al₂SiO₅); visual identification is uncertain from the photograph