Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)
sedimentary
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Organic Materia (Not A Rock Or Mineral) in the encyclopedia
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Chert with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Bivalve Fossil (Clam Stone)
Phylum Mollusca, Class Bivalvia
fossil
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Ironstone Concretion (Limonite/Goethite)
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with iron oxide and other mineral impurities
sedimentary (chemical/biological origin)
Shale (possibly Carbonaceous or Oil Shale)
Argillaceous Sedimentary Rock
sedimentary
Moss Agate
Silicon Dioxide (Chalcedony variety)
mineral
Mosasaur Tooth Fossil
Mosasaurus sp.
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Coal
Coal (Sedimentary Rock / Organic Rock)
sedimentary
Fossiliferous Shale
Carbonaceous Shale (with potential plant/aquatic fossils)
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Fe/Mn/Mg)
mineral
Fossil Coral
Scleractinia (Fossilized Coral) / Calcium Carbonate (CaCO3) or Silica (SiO2)
fossil
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
River Rock
Silica-rich water-worn rock
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Fe/Mg/Mn/Chlorite)
mineral
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Shungite
Shungite (carbon-rich Precambrian rock)
mineral
Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Shungite
Fullerene-bearing carbonaceous rock
mineral
Precious Coral (Red Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Chert Nodule
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Amber
Succinite (fossilized resin, C10H16O)
mineral
Chert (Flint Pebbles)
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Glauconite (Green Sandstone)
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Dendritic Agate
Chalcedony (SiO2) with manganese/iron oxide inclusions
mineral
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Fossilized Coral
Cnidaria (Anthozoa), often replaced by Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Sandstone Chert Concretion
Silica-cemented Concretion (primarily SiO2)
sedimentary
Chert (with Epidote/Quartz veining)
Cryptocrystalline silica (SiO2) with Epidote/Quartz inclusions
sedimentary