Fossilized Horn Coral
Order Rugosa (Calcium Carbonate - CaCO3)
sedimentary
Category
Fossil
Browse fossil specimens identified by the Rock Identifier community.
Mookaite Jasper
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Amber
Succinite (a specific high-quality amber from the Baltic)
Organic Mineraloid
Fossilized Oyster Shell (Limestone/Coquina)
Crassostrea (Fossilized Bivalve), Calcium Carbonate (CaCO3)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Amber (Butterscotch/Egg Yolk Variety)
Succinite (Approx. C10H16O)
Organic Gemstone
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Limestone
Sedimentary Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (mainly SiO2 with varying cements)
sedimentary
Sandstone Cobble
Arenite (primarily SiO2)
sedimentary
Sandstone Pebble (River Rock)
Arenite (primarily SiO2)
sedimentary
Banded Agate
Cryptocrystalline variety of Quartz (SiO2)
mineral
Kambaba Jasper
Stromatolite / Fossilized Algae (Rhyolitic structure)
sedimentary
Dragon Vein Agate
Chalcedony (cryptocrystalline silica, SiO2) variety Agate
mineral
Dendritic Opal (Merlinite)
Hydrated Silica with Manganese/Iron oxide inclusions (SiO2·nH2O)
mineral
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Picture Jasper
Jasper (Silicon Dioxide, SiO2 with impurities)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Sandstone (Wonderstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Dendritic Opal
Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
Hexagonaria (Petoskey Stone)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Tiger's Eye
Titanium-containing Quartz (Silica: SiO2)
Mineral
Amber
Succinite (fossilized resin); C10H16O
mineraloid
Fossilized Brain Coral
Diploria labyrinthiformis (Fossilized)
sedimentary
Kimberlite
Kimberlite
igneous
Dendritic Opal
Opalized Chalcedony with Manganese Inclusions (SiO2 · nH2O)
mineral
Tree Agate
Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Fulgurite
Fulgurite (Lechatelierite), amorphous SiO2
metamorphic
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) - Opaque Impure Chalcedony
sedimentary
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Mookaite (Mookaite Jasper)
Silicified Radiolarite (SiO2 with iron oxides)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Jet
Lignite (Anthracite-grade compact coal)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Organic Gemstone (Sedimentary classification)