Chert (River Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Fossilized)
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Chert (or Fossiliferous Limestone)
Microcrystalline Quartz (SiO2) / Calcium Carbonate (CaCO3)
sedimentary
Belemnite Fossil
Belemnitida (extinct order of Cephalopods)
sedimentary
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Fossilized Tooth Fragment
Vertebrate Fossil (Mammalia indet.)
fossil
Fossiliferous Chert or Limestone
Sedimentary rock containing fossilized marine invertebrates (likely crinoid stems or bryozoans)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Orthoceras Fossil Limestone
Orthoceras (extinct genus of cephalopod); Limestone matrix (CaCO3)
sedimentary
Siderite Concretion (Nodule)
Iron Carbonate (FeCO3) Concretion
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Belemnite Fossil
Belemnitella sp. (rostrum)
fossil
Amber
Succinite (C10H16O)
mineral
Sandstone (Flagstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartz Arenite)
Sandstone (SiO2 with possible mineral cements)
sedimentary
Amber
Succinite (a specific high-quality amber from the Baltic)
Organic Mineraloid
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Mercenaria or similar genus)
fossil
Crinoid Stem Fossil in Matrix
Phylum Echinodermata, Class Crinoidea
fossil
Fossil Belemnite Guard
Belemnitella spp. (rostrum)
fossil
Chert Nodules or Concretion
Cryptocrystalline Quartz (SiO2)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Sandstone with attached barnacles
Quartz sandstone (Silicon Dioxide - SiO2 matrix)
sedimentary
Sandstone Cobble
Arenite (primarily SiO2)
sedimentary
Sandstone Pebble (River Rock)
Arenite (primarily SiO2)
sedimentary
Sandstone with Vitrinite/Coal inclusions
Arenite with Carbonaceous inclusions
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Dendritic Jasper (River Stone)
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Kambaba Jasper
Stromatolite (Fossilized Algae within Microcrystalline Quartz)
sedimentary
Fossil Shark Tooth
Carcharodon sp. (likely Otodus or similar Lamniformes order)
sedimentary
Amber
Succinite
Mineraloid
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Chert (containing a small fossil)
Microcrystalline Quartz (SiO2)
sedimentary
Mookaite Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Amber
Succinite (fossilized tree resin, C10H16O)
fossil
Fossilized Shark Tooth
Carcharocles sp. or similar (Fossilized Fluorapatite)
sedimentary
Seashell (Cone Snail Shell)
Conus sp. (Calcium Carbonate, CaCO3)
fossil
Sea Shell (Fighting Conch Fragment)
Calcium Carbonate (CaCO3) - Strombus alatus fragment
sedimentary (biogenic)
Amber (Butterscotch/Egg Yolk Variety)
Succinite (Approx. C10H16O)
Organic Gemstone
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary