Chert Pebble with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
Learn about Mineral Like Biological Tissue in the encyclopedia
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Northern Shoveler Duck (Note: This is a biological specimen, not a rock)
Spatula clypeata
not a rock (biological/ornithological)
Sea Shell (Fighting Conch Fragment)
Calcium Carbonate (CaCO3) - Strombus alatus fragment
sedimentary (biogenic)
Fossilized Brachiopod Shell in Matrix
Phylum Brachiopoda (typically Calcium Carbonate or Chitinophosphatic)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (specifically for Baltic amber); chemical formula approximately C10H16O
Mineraloid
Pearl
Aragonite and Conchiolin (CaCO3 + organic protein)
mineraloid
Chert (and Fossilized Brachiopod shell)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Petrified Wood
Silicified wood (principally Silicon Dioxide, SiO2)
sedimentary
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Blue Apatite
Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Coral Fossil
Anthozoa (order Scleractinia)
fossil
Chert / River Cobble
Microcrystalline Quartz (SiO2)
sedimentary
Fenestella Bryozoan Fossil
Fenestella (class Stenolaemata)
fossil
Orbicular Jasper (Eye Jasper / Kambaba-like pattern)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Seashell (Cockle Shell)
Cardiidae (Bivalvia), primary composition: Calcium Carbonate (CaCO3) in the form of aragonite or calcite
fossil
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Banded Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Sedimentary Rock
Sedimentary Rock with Invertebrate Fossil Imprint
fossil
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Amber
Succinite (approximate formula C10H16O)
mineral
Amber / Copal
Fossilized Tree Resin (Succinate)
Mineraloid
Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Polished fossilized wood (likely petrified wood)
Silicified wood; commonly quartz (SiO₂) replacing wood tissue
fossil
Amber
Succinurite (C10H16O)
mineraloid
Seashell Fossil
Mollusca (Bivalvia)
fossil
Calcite
Calcium Carbonate (CaCO3)
mineral
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Sea Snail Shell (Top Shell)
Trochidae family (Calcium Carbonate, CaCO3)
mineral
Fossil Shark Tooth (embedded in matrix)
Lamniformes (likely Cretalamna or Squalicorax) within phosphatic/calcareous matrix
sedimentary
Chert (Iron-stained)
Microcrystalline silica (SiO2) with trace Iron oxide (Fe2O3)
sedimentary
Fossiliferous Limestone with Brachiopod
Phylum Brachiopoda in calcitic matrix
sedimentary
Black Pearl (Tahitian-style Cultured Pearl)
Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)
mineral
Kidney Stone
Calcium Oxalate (CaC2O4), Uric Acid, or Struvite
mineral
Chert / Flint Pebble
Chert (SiO2)
sedimentary
Aragonite (Yellow/Honey Tumble)
Calcium Carbonate (CaCO3)
mineral
Fossilized Stingray Mouth Plate
Myliobatidae gen. et sp. indet. (e.g., Myliobatis, Aetobatus)
fossil
Amber
Succinite (fossilized resin)
mineral
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary