Chert Pebble (with Quartz Vein)
Chert (Cryptocrystalline Silica - SiO2)
sedimentary
Category
Organic (Non Rock)
Browse organic (non rock) specimens identified by the Rock Identifier community.
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Synthetic Resin Charm (Seal Shape)
Polymer Resin with plastic glitter / Polyethylene terephthalate glitters
Synthetic material (Not a rock or mineral)
Chert (Brown variety / Common Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
fossil
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (River Pebble)
Microcrystalline quartz (SiO2)
sedimentary
Red Jasper / Chert
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and organic impurities
sedimentary
Petrified Wood
Fossilized Wood (SiO2 replacing organic matter)
fossil
Likely tumbled jasper or chert specimens
Microcrystalline quartz (SiO₂), commonly jasper/chert; exact identification is uncertain from the photograph
sedimentary
Chert (specifically Green Chert/Jasper)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Fossilized Coral (Petoskey Stone or Rugose Coral)
Antophyllum (Hexagonaria) or Scleractinia (CaCO3)
sedimentary
Limestone (Porous/Travertine variant)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Fossiliferous Limestone containing a Brachiopod or Mollusk Impression
Biogenic Sedimentary Rock / Fossiliferous Limestone
sedimentary
Sandstone with Fossil Leaf Impression
Sedimentary rock (Sandstone/Siltstone matrix) with Carbonaceous film fossil
fossil
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) fossilized tooth
fossil
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
mineral
Chert with Quartz Druzy
Microcrystalline Quartz (SiO2) with Drusy Quartz Coating
sedimentary
Beryl (Emerald variety in host rock)
Be3Al2(SiO3)6 (Silicate mineral)
mineral
Chert (includes Flint & Jasper)
Chert (Siliceous sedimentary rock, chemical formula SiO2)
sedimentary
Petrified Coral (Agatized Coral)
Fossilized Anthozoa (Silicon Dioxide replacement - SiO2)
fossil
Chert / Flint
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
sedimentary
Chert / Quartz Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Precious Coral (Red Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Banded Chert (or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Bituminous Coal
Organic Sedimentary Rock (composed mostly of carbon with sulfur and hydrogen)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Slag Glass
Vitreous Silicate Residue
industrial byproduct (anthropogenic rock)
Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Ironstone Concretion / Hematite Nodules
Ferruginous Sedimentary Rock (primarily Hematite Fe2O3 and Goethite FeO(OH))
sedimentary
Blue Agate (Tumbled and Dyed)
Silicon Dioxide (SiO2) with likely organic dyes
mineral
Petrified Wood (Black / Carbonized)
Silicon Dioxide (Quartz/Chalcedony replacing Organic Matter)
fossil
Chert (Flint Nodule)
Microcrystalline and Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Sedimentary Rock (Siltstone/Mudstone with concretion)
Siltstone with Ferruginous Banding
sedimentary
Chert / River Pebble
Microcrystalline Silica (SiO2)
sedimentary