Chert (Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Category
Organic Gemstone (Fossilized Resin)
Browse organic gemstone (fossilized resin) specimens identified by the Rock Identifier community.
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Jasper
Silicon dioxide (SiO2)
sedimentary
Picture Jasper
SiO2
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Rugose Coral Fossil
Order Rugosa
fossil
Fossiliferous Limestone (with Coralline Inclusions)
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone (Murchisonia/Gastropod Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Angel Skin Coral
Corallium rubrum / Corallium spp. (Calcium Carbonate, CaCO3)
gemstone
Fossilized Oyster Shell
Ostrea / Exogyra (Phylum Mollusca)
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Blue lace agate (tumbled)
Microcrystalline quartz, SiO₂ (chalcedony variety)
mineral
Black Freshwater Pearls
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow chalcedony (likely citrine or iron-stained quartz)
Microcrystalline quartz, SiO₂; yellow coloration likely from iron oxides or included quartz varieties
mineral
Black Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Chert (Brown Variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Pink Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineraloid
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Fossilized Coral (Petoskey Stone or similar)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Chert (often called Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Pearl
Calcium Carbonate (Aragonite/Calcite mixed with Conchiolin), CaCO3
mineral
Moss Agate / Chalcedony
Silicon Dioxide (SiO2)
mineral
Sandstone
Quartz Arenite
sedimentary
Fossiliferous Mudstone / River Pebble
Sedimentary rock with trace fossil or inclusion
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Coquina Jasper
Fossiliferous Chalcedony (SiO2)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Ferruginous Sandstone (with ripple marks)
Arenite with Iron-Oxide (Fe2O3) cement
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Ferruginous Siltstone or Mudstone
Ferruginous Siltstone / Goethitic Sandstone
sedimentary
Sandstone
Arenite (Secondary classification based on grain size)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Amygdaloidal Basalt with Quartz/Zeolite Infill
Amygdaloidal Basalt (extrusive volcanic rock with SiO2 or CaAl2Si3O10·3H2O infill)
igneous