Non Geological

Small pale rock fragment

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

Abbey Bominable (Monster High character)

Anthropomorphic Yeti / Digital Animation

Faceted gemstone in a jewelry setting

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

Chert Pebble

Chert (SiO2)

Quartzite Pebble

Metamorphic Quartzite (predominantly SiO2)

Limonite or Ironstone Nodule

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

Weathered iron-stained stone, likely graywacke or altered sandstone

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

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

Fossilized Oyster Shell

Ostreidae (Calcium Carbonate - CaCO3)

Jasper

Silicon dioxide (Microcrystalline Quartz, SiO2)

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

Tumbled blue stone, likely sodalite

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

Laterite

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

Limonite (with goethite)

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

N/A (Non-Geological Specimen)

Green aventurine (likely)

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

Chert (Jasper variety)

Silicon dioxide (SiO2)

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

River Pebble (likely Quartzite or Diorite)

Metamorphosed Quartz-rich Rock / Intermediate Igneous Rock

Petrified Wood

Silicified Wood (SiO2)

Likely weathered limestone fragment

Calcite-rich limestone (CaCO₃), possibly calcareous sandstone

Emerald in Matrix

Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities

Garden Pebble (Quartzite or Limestone fragment)

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

Likely polished dark stone or mineral specimen (unidentifiable from image)

Undetermined; possibly dark quartz-rich material, basalt, or obsidian

Gold

Native Gold (Au)

Obsidian

Volcanic Glass (SiO2)

Quartzite

Quartzite (SiO2)

Anthracite Coal

Carbon (with trace impurities)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Painted Sandstone

Sandstone (clastic sedimentary rock) with acrylic/artistic coating

Obsidian

Volcanic Glass (70% or more SiO2)

Black Obsidian

Volcanic Glass (Silicon Dioxide with impurities)

Small dark pebble, likely basalt or iron-rich rock

Uncertain from image; possibly fine-grained basalt (mafic silicate rock)

Quartzite Pebble

Quartzite (primarily SiO2)

Blue Goldstone

Aventurine Glass

Man-made Blank Ammunition (Brass)

CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)

Concretion or weathered iron-rich rock

Likely limonite/goethite-rich concretion; exact identification requires testing

Fossil shell fragment (likely brachiopod or bivalve)

Indeterminate fossilized carbonate shell; likely Brachiopoda or Bivalvia

Sandstone with Liesegang Rings

Liesegang-banded Sandstone

Tektite (Indochinite)

Tektite (High-silica impact glass)