Organic Material (Likely A Fruit Or Berry)

Chert (potentially worked flint)

Cryptocrystalline microcrystalline quartz (SiO2)

Coarse Sand or Fine Gravel

Detrital Sedimentary Fragments (mostly SiO2)

Amber

Succinite (fossilized resin)

Petrified Wood

Petrified Wood (Silicified Wood)

Quartz-veined Limestone

Sedimentary limestone with quartz/calcite veinlets

Chert Nodules (with Flint core)

Microcrystalline Quartz (SiO2)

Petrified Wood / Fossilized Bone

Silicified / Mineralized Fossil (Silica SiO2)

River Cobble (Sandstone)

Arenite (primarily SiO2)

Chert / Flint

Silicon dioxide (SiO2)

Polished green moss agate cabochon

Moss agate: microcrystalline quartz (SiO₂) with included chlorite/actinolite or iron-manganese minerals

Chert (Flint)

Silicon Dioxide (SiO2)

Desert Rose Fragment (Atypical) / Weathered Chert

Silicon Dioxide (SiO2) or Barium Sulfate (BaSO4) depending on exact mineralogy

Fossilized Bivalve Shell

Class Bivalvia (fossilized)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert (or Flint)

Chert (Sedimentary Cryptocrystalline Sio2)

Pyrite in Shale

Iron Disulfide (FeS2) in Sedimentary Shale

Small rounded pebble

Indeterminate lithic grain; likely weathered sandstone, iron-stained quartz-rich rock, or a concretion

Chert (Flint)

Silicon Dioxide (SiO2)

Weathered vesicular stone, possibly pumice or scoria

Vesicular volcanic rock; likely pumice (highly vesicular rhyolitic material) or scoria (basaltic material)

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Druzy Chalcedony/Quartz on Fluorite core

Silicon Dioxide (SiO2) on Calcium Fluoride (CaF2)

Fossilized Bone

Vertebrate Fossil Fragment (Calcium Phosphate / Hydroxyapatite)

Fossilized Shark Tooth

Carcharocles sp. (likely Lemon or Sand Tiger)

Chert (often called Jasper or Flint)

Microcrystalline Quartz (SiO2)

Likely tumbled jasper or iron-stained quartzite

Microcrystalline quartz (SiO₂), possibly quartzite with iron-oxide inclusions

Chert (Flint Nodular)

Silicon Dioxide (SiO2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with fossil inclusions

Chert (River Siltstone/Flint)

Chert (SiO2)

Granite

Granite

Tektite (likely indochinite)

Natural silica-rich impact glass; predominantly amorphous SiO₂ with aluminum, iron, magnesium, calcium, and sodium

Shale with Iron Staining

Fissile Mudrock (Sedimentary Rock)

Fossiliferous Limestone with Rugose Coral

Calcite (CaCO3) matrix containing Rugosa (order of extinct solitary and colonial corals)

Amber Inlay Jewelry

Fossilized Resin (C10H16O)

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Diamond (in a jewelry setting)

Cubic Carbon (C)

Light Green Quartzite

Metamorphosed Quartz Sandstone (SiO2 with chlorite or mica inclusions)

Blue Agate (Tumbled and Dyed)

Silicon Dioxide (SiO2) with likely organic dyes

Polished crescent-shaped stone pendant

Likely black jade, basalt, or other dark silicate stone; exact identification requires testing

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with fossil inclusions

Siltstone

Siltstone (composed of clastic quartz and feldspar grains)