Amber in Matrix
Succinite (Carbon-based organic polymer)
Organic (Sedimentary context)
Category
Organic (Sedimentary Context)
Browse organic (sedimentary context) specimens identified by the Rock Identifier community.
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Chert (Flint) Artifact
Silicon Dioxide (SiO2)
sedimentary
Seashell (Cone Snail Shell)
Conus sp. (Calcium Carbonate, CaCO3)
fossil
Fossilized bone fragment
Fossil bone, composed chiefly of carbonate-fluorapatite (bioapatite)
fossil
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Likely bituminous coal
Coal, predominantly maceral-rich carbonaceous material (composition varies)
sedimentary
Chert (Flint variety)
Microcrystalline context of Quartz (SiO2)
sedimentary
Coprolite
Fossilized Feces
fossil
Kidney Stone
Calcium Oxalate (CaC2O4), Uric Acid, or Struvite
mineral
Chert (Arrowhead/Projectile Point)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Sandstone Concretion (Ironstone Phosphorite)
Ferruginous Sandstone (variable Fe-oxide/hydroxide composition)
sedimentary
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Chert (with nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Chert (Arrowhead/Projectile Point)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Black Jasper
Black Jasper (Silicate mineral - SiO2)
sedimentary
Black Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (with Drusy Quartz Pocket)
Silicon Dioxide (SiO2)
sedimentary
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Dark flint or chert fragment
Microcrystalline quartz (SiO₂), likely chert/flint
sedimentary
Chert (Smoky variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sulfidic Mudstone with Pyrite/Goethite
Sulfidic Siltstone/Mudstone (FeS2)
sedimentary
Botryoidal Hematite
Iron Oxide, Fe2O3
mineral
Unidentified small brown rock
Undetermined; image does not show enough detail for reliable identification
sedimentary
Stromatolite
Biogenic sedimentary rock / Stromatolite
sedimentary
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Sedimentary / Mineral
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint in this context)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint in this context)
Silicon Dioxide (SiO2)
sedimentary
Unidentifiable embedded dark fragment
Indeterminate; possibly a dark silicate mineral or lithic inclusion
mineral
Weathered stone nodule or concretion
Unidentified lithic concretion; composition cannot be determined from the image
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite and Sunstone
Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)
mineral
Chert / Flint Handaxe
Cryptocrystalline Quartz (SiO2)
sedimentary