Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions of Chlorite, Manganese, or Iron
mineral
Category
Organic Mineral
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Moss Agate with Jasper
Chalcedony (SiO2 with inclusions)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Fossilized Bark
Lepidodendron / Sigillaria fossil impression
fossil
Polished moss agate / dendritic agate
Microcrystalline quartz (SiO₂) with iron- and manganese-oxide inclusions
mineral
Pink Opal
Hydrated silica (SiO2 "n H2O)
mineral
Green Moss Agate
Agate (Silicon Dioxide - SiO2 with inclusions of Manganese/Iron oxides)
mineral
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Shark Tooth Fossil
Elasmobranchii fossil (likely Carcharias or Odontaspis sp.)
fossil
Fossil Shark Tooth
Odontaspididae (likely Carcharias sp.)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Fossilized Shark Tooth
Lamniformes (order) fossil
fossil
Petrified Wood
Silicified wood (principally SiO2)
fossil
Petrified Bone Pebble
Silicified Fossilized Bone
fossil
Fossilized Crab Carapace (Concretion)
Decapoda (fossil), typically preserved in calcite or siderite concretion
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Moqui Marbles
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
metamorphic
Fossilized Oyster Shell (Limestone/Coquina)
Crassostrea (Fossilized Bivalve), Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Amber with inclusion
Amber (Fossilized Tree Resin)
mineral
Amber (Copal)
Succinate (Fossilized Resin)
mineraloid
Amber / Copal
Succinite (fossilized tree resin)
mineraloid
Chert (Flint)
Chert (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood Agate
Silicified Wood (primarily SiO2)
fossil
Red Jasper with Quartz
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized bivalve shell
Paleozoic–Mesozoic bivalve fossil; commonly classified as Bivalvia indet.
fossil
Pearl
Calcium carbonate (CaCO3) in the form of aragonite
gemstone
Petrified Wood
Silicified wood (Quartz, Chalcedony, or Opal)
sedimentary
Amber
Succinrite (Organic Gemstone)
mineraloid
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Fossilized Rugose Coral (Horn Coral)
Order Rugosa
sedimentary
Fossilized bone fragment
Petrified bone, mineral-replaced vertebrate bone; exact taxon indeterminate
fossil
Jasper
Microcrystalline Quartz (SiO2)
Sedimentary/Mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Vivianite
Vivianite, Fe2+3(PO4)2·8H2O
mineral
Pyrite in Shale
Iron Disulfide (FeS2) in Sedimentary Shale
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral