Organic Material (Likely A Fruit Or Berry)

Concretion (likely iron-rich sandstone or claystone concretion)

Diagenetic carbonate/iron-oxide concretion; exact mineralogy requires testing

Coal (most likely Bituminous or Anthracite)

Coal (organic sedimentary rock)

Tumbled brown chalcedony or quartzite pebble

Microcrystalline quartz (SiO₂), likely chalcedony; exact identification requires testing

Petrified Wood

Silicified Wood (SiO2)

Carved red coral bead (likely coral or coral-colored resin)

Corallium spp. (precious coral; calcium carbonate, CaCO₃)

Tumbled chert or flint

Microcrystalline quartz (SiO₂), likely brown chert/flint

Petrified Wood

Silicified Wood (SiO2)

Polished fossilized wood (petrified wood), likely agatized

Silicified wood; predominantly microcrystalline quartz/chalcedony (SiO₂), with iron-oxide coloration

Iron-stained fossiliferous rock, possibly fossil wood

Likely silicified/petrified wood in iron-rich silica matrix; exact identification requires microscopy

Small seashell fossil or shell fragment

Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate

Yellow cabochon, likely amber or yellow glass/resin

Unconfirmed; possibly amber (fossilized tree resin, an amorphous organic material)

Tumbled yellow calcite (probable)

Calcite — calcium carbonate, CaCO₃

Chert Fossil (Pebble)

Microcrystalline Quartz (SiO2) with biogenic inclusions

Fossil bivalve shell

Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features

Petrified Wood

Silicified Wood (SiO2)

Weathered iron-rich rock, likely ferruginous sandstone or lateritic concretion

Iron-oxide–cemented sandstone; commonly dominated by quartz (SiO₂), goethite (FeO(OH)) and hematite (Fe₂O₃)

Jasper

Silicon Dioxide (Microcrystalline Quartz / Chalcedony)

Weathered Sedimentary Rock

Sedimentary Rock

Likely graphite-rich metamorphic rock (graphitic schist)

Graphitic schist; chiefly carbon (graphite) with quartz, mica, and possibly sulfides

Fossilized Bone

Permineralized Vertebrate Bone

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Petrified Wood

Silicified Wood (SiO2)

Amber

Succiniferous organic material (Succinite)

Jasper with Quartz Vein

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Cave (botryoidal) aragonite or calcite specimen

Aragonite (CaCO₃), possibly mixed with calcite and iron-oxide inclusions

Petrified Wood

Silicified wood (SiO2)

Pearl necklace

Pearl, primarily aragonite (CaCO₃) and conchiolin

Graphitic schist (probable)

Graphite-bearing mica schist; predominantly carbon (C) with mica, quartz, and possibly sulfides

Chert (with Calcite Veining)

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) veins

Likely amber cabochon ring

Amber, fossilized tree resin (organic mineraloid; not a mineral)

Petrified Wood

Silicified Wood (SiO2)

Yellow calcite crystal

Calcite (CaCO₃), likely honey/yellow calcite

Flint/chert nodule with a weathered cortex

Microcrystalline quartz (SiO₂), likely flint or dark chert

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossilized Bone

Vertebrate fossil (mineralized bone)

Honey-colored chert or flint fragment

Microcrystalline quartz (SiO₂), likely chalcedony-rich chert

Dendritic jasper/chalcedony

Silica-rich microcrystalline quartz (SiO₂) with manganese-oxide dendrites

Likely petrified wood or silicified fossil fragment

Silicified wood; predominantly microcrystalline quartz (SiO₂)

Petrified Wood

Silicified Wood (Permineralized wood)

Chert (Quartz Variety)

Silicon Dioxide (SiO2)