Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Category
Organic Gemstone (Not A Mineral)
Browse organic gemstone (not a mineral) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Not A Mineral) in the encyclopedia
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Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Oyster Shell Fragment
Crassostrea virginica (or related Bivalvia)
fossil
Sandstone
Arenite
sedimentary
Fossilized Bone
Petrified Bone (Fluorapatite / Calcium Phosphate replacement)
fossil
Chert (includes Flint & Jasper)
Chert (Siliceous sedimentary rock, chemical formula SiO2)
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Limonite streaks)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host
mineral
Fossilized Bivalve Shell
Class Bivalvia (fossilized)
fossil
Enrolled Trilobite Fossil
Phylum Arthropoda, Class Trilobita (likely Calymene or Flexicalymene)
fossil
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2)
sedimentary
Banded Calcite (Zebra Calcite)
Calcite (CaCO3) with trace organic or oxide inclusions
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chalcedony (Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Amber / Copal
Organic resin, C10H16O
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Chert (specifically Flint or Common Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Amber / Copal
Fossilized Tree Resin (Succinate)
Mineraloid
Petrified Wood
Silicified Wood (SiO2)
fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
mineral
Garnet (Almandine-Pyrope)
Almandine-Pyrope Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3
mineral
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Chert (Nodular or Massive Variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Coral (Precious Coral)
Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO 3 ).
Mineral, Organic Gemstone
Chert / Flint
Silicon Dioxide (SiO₂)
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Jasper-rich)
Silicon Dioxide (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite
fossil
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
![Fossilized bone fragment (probable mammalian tooth or bone) (Mineralized bone, commonly hydroxyapatite [Ca5(PO4)3(OH)] replaced or impregnated by silica/calcite) — fossil](https://media.rock.id/fossilized-bone-fragment-probable-6435bbec-570b-407e-9c9f-870b904b8d23-thumbnail.jpg)
Fossilized bone fragment (probable mammalian tooth or bone)
Mineralized bone, commonly hydroxyapatite [Ca5(PO4)3(OH)] replaced or impregnated by silica/calcite
fossil
Pearl
Calcium Carbonate (primarily Aragonite and Calcite), CaCO3
mineral
Moss Agate
Silicon Dioxide (Chalcedony variety)
mineral
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Hornblende inclusions
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral