Non Geological

Quartzite River Cobble

Quartzite (SiO2)

River Stone (Chert/Basalt mix)

Microcrystalline Quartz (Chert) / Basalt

Black glassy volcanic rock, likely scoria or obsidian

Vesicular basaltic scoria (probable); possibly dark obsidian

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Beaded bracelet with likely quartz or glass beads

Uncertain; the pale beads may be quartz (SiO₂), but the image does not show diagnostic features

Gold nugget or gold-bearing fragment

Native gold (Au), possibly gold-colored metal or coated material

Stainless Steel Spoon

Iron-Chromium Alloy (Fe + Cr + Ni)

Anthracite

Anthracite Coal

Greenstone / Glauconitic Siltstone

Metabasalt or Glauconite-rich Sedimentary Rock

Abbey Bominable (Monster High character)

Anthropomorphic Yeti / Digital Animation

Tiny amber-colored crystal or mineral fragment

Indeterminate from image; possibly quartz, citrine, topaz, or iron-stained feldspar

Black beaded bracelet, likely black onyx or glass

Possibly chalcedony (microcrystalline quartz, SiO₂); the beads may instead be man-made glass

Tumbled pale green aventurine or common green quartzite

Quartz, SiO₂, likely with fuchsite or chlorite inclusions

Chert Pebble

Chert (SiO2)

Possible blue sapphire

Corundum (Al₂O₃), possibly blue sapphire

Faceted gemstone in a jewelry setting

Indeterminate from image; likely quartz, cubic zirconia, or another transparent faceted stone

Quartzite Pebble

Metamorphic Quartzite (predominantly SiO2)

Small pale rock fragment

Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment

Limonite or Ironstone Nodule

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

Fossilized Oyster Shell

Ostreidae (Calcium Carbonate - CaCO3)

N/A (Non-Geological Specimen)

Jasper

Silicon dioxide (Microcrystalline Quartz, SiO2)

Weathered iron-stained stone, likely graywacke or altered sandstone

Indeterminate lithic fragment; probable quartz-rich sandstone/graywacke with iron-oxide staining

Laterite

Laterite (Iron and Aluminum-rich residual soil/rock)

Tumbled blue stone, likely sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; identification uncertain from image alone

Limonite (with goethite)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

White, weathered carbonate rock (possibly limestone)

Likely calcite-rich limestone; exact identification is uncertain from the photograph

Quartzite

Metamorphic Quartzite

Tumbled carnelian (orange chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides

Faceted amber-colored gemstone, possibly citrine

Unidentified transparent gem; citrine is quartz (SiO₂), but the image alone cannot confirm the material

Green aventurine (likely)

Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite

Beaded mineral/crystal jewelry (likely turquoise and coral accents)

Variable; blue beads may be turquoise (CuAl6(PO4)4(OH)8·4H2O), with possible dyed howlite, glass, or composite materials

Chert (Jasper variety)

Silicon dioxide (SiO2)

River Pebble (likely Quartzite or Diorite)

Metamorphosed Quartz-rich Rock / Intermediate Igneous Rock

Tumbled green aventurine (probable)

Quartz (SiO₂) with fuchsite or other green mica inclusions

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), with green fuchsite mica inclusions

Petrified Wood

Silicified Wood (SiO2)

Likely weathered limestone fragment

Calcite-rich limestone (CaCO₃), possibly calcareous sandstone

Garden Pebble (Quartzite or Limestone fragment)

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment

Emerald in Matrix

Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities

Obsidian

Volcanic Glass (SiO2)