Baroque cultured pearl necklace
Pearl: nacre composed mainly of aragonite (CaCO₃) and conchiolin
gemstone
Category
Mineral, Organic Gemstone
Browse mineral, organic gemstone specimens identified by the Rock Identifier community.
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Pearl
Pearl; primarily aragonite (CaCO₃) with conchiolin
gemstone
Amber
Fossilized Resin (C10H16O)
mineral
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
Mineraloid
Amber
Succinite (C10H16O)
mineraloid
Fossilized Tooth Fragment
Vertebrate Fossil (Mammalia indet.)
fossil
Black Limestone with Calcite Veining
Bituminous Limestone (CaCO3 with Organic Carbon inclusions)
sedimentary
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Chert Pebble (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (Fossilized Resin)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Graphite-rich metamorphic rock (graphitic schist)
Graphitic schist; chiefly graphite (C), quartz (SiO₂), and mica minerals
metamorphic
Jasper
Jasper (Silicon Dioxide) - SiO2
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Fossiliferous Sedimentary Rock
Sedimentary Rock with Invertebrate Fossil Imprint
fossil
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold) Cube
Iron Sulfide (FeS2)
mineral
Chert (specifically Flint or Common Chert)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Chert (variations include Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Green variety)
Silicon Dioxide (SiO2)
sedimentary
Jasper (Petrified Wood variant)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (Jasper/Chalcedony pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or Agate nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (var. Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Blue-Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Green variety)
Microcrystalline Opaline/Quartz (SiO2)
sedimentary
Amber (Copal)
Succinate (Fossilized Tree Resin)
mineraloid
Chert (Jasper)
Microcrystalline quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Shark Tooth Fossil
Carcharhiniformes or Lamniformes (order level fossil)
fossil
Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Polished amber cabochon pendant
Amber (fossilized plant resin), chiefly polymerized succinite; approximate formula C10H16O
gemstone
Tumbled amber-like inclusion
Likely amber (fossilized tree resin; complex polymer), but identification is uncertain from the image
gemstone
Mother of Pearl (Nacre)
Aragonite (CaCO3) with Organic Matrix
mineral
Limestone (or Sandstone)
Calcium Carbonate (CaCO3) / Silica (SiO2)
sedimentary
Sandstone (with Moss)
Quartz Arenite / Sandstone
sedimentary
Poppy Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Fossilized Bone Fragment
Vertebrate Fossil
fossil
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary