Fossiliferous Siltstone
Clastic Sedimentary Rock with Fossil Inclusions
sedimentary
Category
Organic Structure (Not A Rock)
Browse organic structure (not a rock) specimens identified by the Rock Identifier community.
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Chert (Jasper)
Microcrystalline Quartz (SiO2) with iron oxide impurities
sedimentary
Moss Agate (Crescent Moon Shape)
Silicon Dioxide (SiO2) with iron/manganese inclusions
mineral
Amber
Succinite (with empirical formula approximately C10H16O)
Organic Mineraloid
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Sedimentary
Yellow Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Bivalve Shell (Fossilized Clam)
Bivalvia (class) / CaCO3 (Calcium Carbonate)
fossil
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Chert (variations include Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
gemstone
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Likely graphite-rich metamorphic rock (graphitic schist)
Graphitic schist; chiefly carbon (graphite) with quartz, mica, and possibly sulfides
metamorphic
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
fossil
Agatized Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Limestone Pebble
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Amber (Rough Baltics/Beach Specimen)
Succinicum (Organic Gemstone - Fossilized Resin)
mineral
Chert (Pebble)
Microcrystalline to Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenicola (comprising mostly Quartz, SiO2)
sedimentary
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Dendritic Agate (Tree Agate)
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Travertine / Tufa
Calcium Carbonate (CaCO3)
sedimentary
Chalcedony in Matrix (likely Agatized Coral or Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Shale with Coprolite influence
Argillaceous sedimentary rock (Shale/Mudstone)
sedimentary
Lapis Lazuli
Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2
metamorphic
Red Coral
Corallium rubrum
gemstone
Shale
Shale (fine-grained clastic sedimentary rock)
Sedimentary
Red Coral (Sponge Coral / Apple Coral)
Corallium rubrum (calcium carbonate / organic gem)
gemstone
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Amber
Succinite
Organic mineraloid
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Fossilized Echinoid / Sea Urchin Internal Mold
Echinoidea internal cast (steinkern)
fossil
Chert (Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone with Calcite Veining
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) fossilized tooth
fossil
Sandstone Pebble (River Rock)
Sandstone (Quartz-rich sedimentary rock with iron oxide staining)
sedimentary
Shale
Fissile Clay-dominant Mudrock (SiO2, Al2O3, K2O, Na2O, CaO, MgO)
sedimentary