Organic (Paper And Cellulose)

Purple Agate (Dyed Chalcedony)

SiO2 (Silicon Dioxide) with organic dyes

Fossilized Coral (Petoskey Stone or Rugose Coral)

Antophyllum (Hexagonaria) or Scleractinia (CaCO3)

Fossil Coral

Cnidaria Anthozoa (Fossilized)

Petrified Wood

Silicified Wood (SiO2 / Quartz pseudomorph after wood)

Polished petrified wood

Silicified wood; primarily microcrystalline quartz (SiO₂) replacing woody tissue

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Fossilized Coral (Petoskey Stone / Favosites)

Hexagonaria percarinata / Favosites sp. (Calcite, CaCO3)

Tumbled brown agate (likely moss or plume agate)

Microcrystalline quartz, chiefly chalcedony (SiO₂), with iron-oxide and possibly mineral inclusions

Septarian Nodule (Micro-fragment)

Septarian Nodule / Concretion (CaCO3 + CaMg(CO3)2 + Quartz)

Polished petrified wood

Silicified wood; predominantly microcrystalline quartz (SiO₂), often chalcedony

Dendritic Limestone

Calcite with Manganese Oxide (Manganese Dendrites)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Fossilized wood or plant fragment

Petrified wood (silicified fossil wood; commonly Araucarioxylon or related taxa)

Petrified Wood

Silicified Wood (SiO2)

Banded Marble (Egg Carving)

Metamorphic crystalline limestone (predominantly Calcite, CaCO3)

Zebra Rock / Zebra Marble

Banded Limestone-Marble Transition

Petrified wood

Silicified wood, commonly quartz/chalcedony (SiO₂) replacing wood tissue

Polished fossiliferous limestone (likely crinoidal or coral limestone)

Bioclastic carbonate rock, chiefly calcite (CaCO₃)

Tumbled fossiliferous limestone

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

Fossil Coral (Rugosa or Solitary Coral)

Rugosa (Order), often referred to as 'Horn Coral' (Lithostrotionella or Grewingkia)

Fossilized wood, likely silicified petrified wood

Silicified wood (fossil wood; commonly quartz/chalcedony replacing organic tissue)

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood (SiO2 - Silicon Dioxide)

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of cellulose)

Painted River Rock

Painted Quartzite or Smooth Siltstone

Talc

Mg3Si4O10(OH)2

Inspirational River Stone (Quartzite)

Metamorphosed Quartz-rich Rock (Quartzite) with SiO2 composition

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Sandstone

Arenite

Dyed Agate Geode Slice

Silicon Dioxide (SiO2)

Petoskey Stone

Hexagonaria percarinata

Painted Pet Rock (Quartzite/Sandstone base)

Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments

Petoskey Stone

Hexagonaria percarinata (Silicified/Calcitic)

Painted Garden Rock (likely Granite or Limestone base)

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments

Painted River Rock

Polished fluvial clast with acrylic/synthetic pigment coating

Biotite (Black Mica)

Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)

Amethyst (Resin Carving/Orgonite)

Silicon Dioxide (SiO2) with iron impurities

Likely graphite-rich schist

Graphite-bearing schist, composed mainly of graphite with possible mica and quartz

Kaolin (China Clay)

Kaolinite [Al2Si2O5(OH)4]

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Coal

Bituminous Coal / Anthracite

Talc

Mg3Si4O10(OH)2