Organic Material (Likely A Fruit Or Berry)

Cave (botryoidal) aragonite or calcite specimen

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

Jasper

Silicon Dioxide (Microcrystalline Quartz / Chalcedony)

Weathered Sedimentary Rock

Sedimentary Rock

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

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

Petrified Wood

Silicified Wood (SiO2)

Small seashell fossil or shell fragment

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

Graphitic schist (probable)

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

Chert (Agatized/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossil bivalve shell

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

Flint/chert nodule with a weathered cortex

Microcrystalline quartz (SiO₂), likely flint or dark chert

Yellow calcite crystal

Calcite (CaCO₃), likely honey/yellow calcite

Likely graphite-rich metamorphic rock (graphitic schist)

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

Chert (Quartz Variety)

Silicon Dioxide (SiO2)

Honey-colored chert or flint fragment

Microcrystalline quartz (SiO₂), likely chalcedony-rich chert

Likely petrified wood or silicified fossil fragment

Silicified wood; predominantly microcrystalline quartz (SiO₂)

Tumbled fossiliferous limestone

Micritic limestone, likely bioclastic/fossiliferous carbonate rock (predominantly CaCO₃)

Brachiopod Fossil in Limestone

Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)

Banded sandstone pebble

Lithified quartz–feldspar sandstone, likely ferruginous and carbonaceous laminae

Honey calcite (orange calcite)

Calcite, calcium carbonate (CaCO₃)

Petrified Wood

Silicified Wood (SiO2)

Fossilized Bone

Permineralized Vertebrate Bone

Bituminous coal (likely)

Coal, primarily carbon with macerals and variable mineral matter; commonly represented by approximate composition C-rich organic material

Tumbled black stone, likely black agate or onyx

Microcrystalline quartz (SiO₂), probably chalcedony/black agate; exact identification requires testing

Banded Chert / Flint

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Fossilized leaf or plant impression in shale

Carbonized/impressed plant fossil, likely in fine-grained shale or mudstone; exact taxon indeterminate from the image

Dendritic jasper/chalcedony

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

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

Graphite-rich schist (likely graphite ore)

Graphite-bearing schist; predominantly graphitic carbon (C) with mica, quartz, and possible feldspar

Petrified Wood

Silicified wood (primarily Silicon Dioxide - SiO2)

Fossilized Shark Tooth

Carcharocles or Otodus sp. (Micro-fossilized)

Polished moss agate (likely dendritic agate)

Chalcedony, microcrystalline quartz (SiO₂), with inclusions of manganese/iron oxides or hornblende

Petrified Wood

Silicified Wood (Permineralized wood)

Fossilized Bone

Vertebrate fossil (mineralized bone)

Calcite

Calcite (calcium carbonate, CaCO₃), likely massive or crystalline limestone-derived material

Amber

Succiniferous organic material (Succinite)

Chert (Grey-Green Var.)

Silicon Dioxide (SiO2)

Polished amber-like chalcedony/jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony or jasper; amber cannot be confirmed visually

Fossiliferous Limestone

Carbonate Rock (CaCO3 with organic inclusions)

Orbicular granite (likely Rapakivi-type granite)

Granite, chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende