Petrified Wood
Silicified Wood (SiO2)
mineral
Category
Organic (Biological Organism)
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Fossilized Shell in Limestone
Bivalve fossil (CaCO3) in Carbonate Sedimentary Rock
sedimentary
Amber
Succinite
mineral
Red Coral (with Hematite and Black Pearl accents)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Hag Stone (Chert/Flint with natural perforation)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Shell Cameo (Sardonyx Shell)
Cassis madagascariensis (Sardonyx shell)
mineral (biogenic silica/calcium carbonate substrate)
Chert Nodules in Limestone
Cryptocrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Fossiliferous Limestone (Coquina / Shell Limestone)
Bioclastic Limestone (CaCO3)
sedimentary
Petrified Wood
Siliconized Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
sedimentary
Petrified Wood
Silicified Wood (primarily Silicon Dioxide, SiO2)
mineral
Marine invertebrate fossils (Brachiopods and Gastropods)
Phylum Brachiopoda and Class Gastropoda
fossil
Limestone (Fossiliferous)
Calcium Carbonate (CaCO3)
sedimentary
Shale
Laminated Fissile Pelite
sedimentary
Hag Stone
Natural Perforated Flint or Chert (SiO2)
sedimentary
Coal
Bituminous coal (Complex organic sedimentary rock)
sedimentary
Banded Calcite (Zebra Calcite)
Calcite (CaCO3) with trace organic or oxide inclusions
sedimentary
Amber
Succinite (organic mineraloid); Chemical formula: C10H16O
mineral
Fancy Jasper
Silicon Dioxide (SiO2) with iron and organic inclusions
sedimentary
Amber
Organic gemstone (Succinite is common if from the Baltic)
mineral
Bituminous Coal
Organic-rich sedimentary rock (Complex hydrocarbons)
sedimentary
Amber (Cherry or Red variety)
Succinite (with various trace amounts of organic compounds)
Organic Gemstone (not a rock)
Pearl
Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)
mineral
Red Amber (Burmite/Cherry Amber)
Succinite / Retinite (Organic Fossilized Resin, C10H16O)
Mineraloid (Organic)
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Amber
Succinates
mineraloid
Siderite Concretion in Shale
Iron carbonate (FeCO3) in Mudstone/Shale matrix
sedimentary
Amber
Fossilized Tree Resin
gemstone
Freshwater Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic composite
gemstone
Green Slate or Metamorphic Rock with Moss/Lichen
Metamorphic rock / Phyllite or Slate variant
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Fossiliferous Limestone
Fossiliferous Limestone (Sedimentary Rock)
fossil
Orthoceras Fossil Limestone
Orthoceras (extinct Cephalopod fossil) in Matrix
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Coquina / Shelly Limestone
Coquina (Biogenic Limestone)
sedimentary
Sandstone with Quartz Crystal Infill
Quartz-cemented quartz arenite
sedimentary
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary