Fossil Shark Tooth
Carcharhinidae or Lamniformes sp. (possibly Carcharodon or Otodus genus)
fossil
Category
Organic Gemstone (Fossilized Resin)
Browse organic gemstone (fossilized resin) specimens identified by the Rock Identifier community.
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Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Red Ochre (Hematite-rich Clay)
Limonitic/Hematitic Claystone (Fe2O3 with clay minerals)
Sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites sp. (Extinct genus of tabulate coral)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Polished ocean jasper (orbicular jasper), probable
Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions
mineral
Fossil shell fragment
Likely a fossilized brachiopod or bivalve; exact taxon cannot be determined from the image
fossil
Sandstone
Arenite
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary (fossilized)
Chert (Mudstone)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Basanite / Jasperoid)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl (likely Freshwater or Akoya Cultured)
Aragonite / Conchiolin composite (CaCO3)
Mineralloid (Organic gemstone)
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Sandstone
Arenite
sedimentary
Gold (in Opaque Matrix/Jewelry)
Native Gold (Au)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) within a resin matrix
igneous
Petoskey Stone / Fossilized Coral
Hexagonaria percarinata
fossil
Chert (Iron-stained or Dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Chert (Yellow or Brown Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Polished blue banded agate cabochon/ornamental slab
Microcrystalline quartz (chalcedony), SiO₂, with blue coloring or inclusions
mineral
Green Chert (Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Black Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood (Silicified Wood)
Silicified fossil wood (SiO2)
metamorphic
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Chert (Black Chert / Flint)
Silicon Dioxide (SiO2)
sedimentary
Green Moss Agate
Silicon Dioxide (SiO2) with Mineral Inclusions
sedimentary
Fossil Coral (likely Favosites or Honeycomb Coral)
Class Anthozoa, Order Tabulata, Genus Favosites
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions of Chlorite, Manganese, or Iron
mineral
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Cockle Shell (Bivalve)
Cardiidae (Calcium Carbonate, CaCO3)
fossil
Dyed Pink Quartzite (Jadeite Simulant)
Silicon Dioxide (SiO2) with organic dye
metamorphic
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin (CaCO3)
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Fossil Seashell
Invertebrate fossil (Bivalvia)
fossil
Fulgurite
Fulgurite (Lechatelierite / Vitreous Silica)
mineral
Lepidodendron Fossil (Scale Tree)
Lepidodendron sp.
fossil
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 secondary)
sedimentary