Unakite (or Polished Jasper Pebble)
Altered Granite (Epidote-Orthoclase Rock)
metamorphic
Category
Sedimentary (Fossilized Organic Remain)
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Unakite
Altered Granite (Epidotized Granite)
metamorphic
Unakite / Feldspar Veined Metamorphic Pebble
Metamorphic Rock with K-Feldspar, Epidote, and Quartz
metamorphic
Unakite
Metamorphosed Granite (Orthoclase, Epidote, Quartz)
metamorphic
Dendritic Siltstone
Siltstone with Manganese Oxide dendrites (MnO2)
sedimentary
Fossilized Shark Tooth (Otodus)
Otodus obliquus
fossil
Amber
Succinite (approximate formula C10H16O)
mineral
Amber (Dark/Black Variety)
Succinite (Resinite), C10H16O
mineral
Tumbled amber
Amber (fossilized plant resin; commonly succinite, C10H16O)
gemstone
Cockle Shell Fossil
Cardium (Bivalvia)
fossil
Amber
Succinite
mineral
Sandstone with Iron Concretion
Arenite with Limonite/Goethite Concretion
sedimentary
Fossiliferous Flint or Chert with Bryozoan Fossils
Sedimentary cryptocrystalline quartz (SiO2) with fossil inclusions
sedimentary
Fossilized Shark Tooth (Carcharocles/Otodus or Sand Tiger Shark Tooth)
Elasmobranchii (Fossilized Tooth)
fossil
Fossilized Coral (Petrified Coral)
Lithostrotionella (example genus) / Scleractinia
fossil
Chert
Microcrystalline quartz (SiO2)
sedimentary
Sandstone (Limonitic/Arkose)
Sandstone (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Amber
Succinite (organic mineraloid); Chemical formula: C10H16O
mineral
Chert / Flint (Brecciated or Fossiliferous Limestone with Silicification)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Megalodon or Carcharocles species fragment)
Otodus megalodon / Carcharocles spp. (Apatite / Calcium Phosphate)
fossil
Ironstone Nodule / Limonite Concretion
Iron-rich sedimentary concretion (FeO(OH)·nH2O / Fe2O3)
sedimentary
Fossilized Wood (Petrified Wood)
Silicified Wood (primarily quartz/chalcedony replacing organic matter)
Sedimentary (with some aspects of mineral replacement)
Kambaba Jasper
Stromatolite Jasper (Microcrystalline Quartz with Fossilized Cyanobacteria)
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with Fe-oxide impurities)
sedimentary
Amber
Succiniferous organic material (Succinite)
fossil
Amber
Amber (Amorphous Organic Hydrocarbon)
mineral
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Mookaite Jasper
Radiolarite (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Fossilized Mammoth Tooth Fragment
Mammuthus primigenius (or Mammuthus sp.)
fossil
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)
sedimentary
Coprolite
Coprolite
sedimentary
Fossiliferous Limestone with Crinoid stems
Limestone (CaCO3) containing Crinoidea fossils
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Stromatolitic Rhyolite/Jasper (SiO2)
sedimentary
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Dendritic Agate (or Dendritic Opal)
SiO2 (for Agate), SiO2·nH2O (for Opal)
Mineral
Quartzite with Mafic Inclusions
Metamorphic Quartzite
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone
metamorphic