Iron-rich meteorite candidate
Probable stony-iron or iron meteorite; exact classification requires testing
meteorite
Category
Organic Gemstone (Sedimentary Classification)
Browse organic gemstone (sedimentary classification) specimens identified by the Rock Identifier community.
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Weathered quartz-bearing metamorphic rock, likely gneiss or schist
Quartz–feldspar–mica rock; exact classification is uncertain from the photograph
metamorphic
Shale or Slate
Shale (Sedimentary) or Slate (Metamorphic)
sedimentary or metamorphic
Chert (Commonly known as Flint or Jasper when pigmented)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Cherty Flint/Jasper variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite in Shale
Iron Disulfide (FeS2)
mineral
Tahitian black pearl strand
Cultured pearl; aragonite (CaCO₃) nacre
gemstone
Iron-rich meteorite candidate
Probable ordinary chondrite or iron meteorite fragment; identification requires testing
meteorite
Amber
Succinite (fossilized tree resin), C10H16O
Organic Gemstone
Amber
Succiniferous organic material (Succinite)
fossil
Pearl
Calcium Carbonate (Aragonite) with Conchiolin; formula: CaCO3
mineral
Amber
Fossilized Tree Resin (Organic Polymer)
gemstone
Mother of Pearl (Nacre)
Calcium Carbonate (Aragonite) with organic conchiolin
gemstone
Chert (often called Flint or Jasper)
Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)
sedimentary
Pearl necklace
Pearl: biogenic calcium carbonate, primarily aragonite (CaCO₃), in a conchiolin matrix
gemstone
Moss Agate
Silicon Dioxide (Chalcedony variety) with green hornblende or chlorite inclusions - SiO2
gemstone
Seashell (Cone Snail Shell)
Conus sp. (Calcium Carbonate, CaCO3)
fossil
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Pink Coral
Corallium rubrum (or related species, composed of calcium carbonate)
gemstone
Red Coral
Corallium rubrum
mineral
Amber (Butterscotch/Egg Yolk Variety)
Succinite (Approx. C10H16O)
Organic Gemstone
Chert (often called Flint when dark)
Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)
sedimentary
Pearl
Nacre (primarily aragonite, CaCO₃, in an organic conchiolin matrix)
gemstone
Pearl
Organic Mineraloid (CaCO3 + Conchiolin)
mineral
Red Coral (Sponge Coral / Apple Coral)
Corallium rubrum (calcium carbonate / organic gem)
gemstone
Natural Freshwater Pearl
Calcium Carbonate (Aragonite and Calcite), CaCO3
gemstone
Black Limestone with Calcite Veining
Bituminous Limestone (CaCO3 with Organic Carbon inclusions)
sedimentary
Amber
Succinite (C10H16O)
mineraloid
Fossil Coral / Crinoid Stem section
Anthozoa / Crinoidea fossil
fossil
Amber
Succinite
mineral
Pyrite
Pyrite (Iron sulfide, FeS₂)
Mineral
Pearl
Nacre (aragonite, CaCO₃, with conchiolin)
gemstone
Pearl
Nacre (aragonite, CaCO₃, in a conchiolin matrix)
gemstone
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Coral
Corallium rubrum
gemstone
Chert / Flint
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
sedimentary
Amber
Succinite (C10H16O)
Mineraloid (Organic)
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Chert (and Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite
mineral
Amber (possibly rough amber)
Fossilized tree resin; chemically a complex organic mixture, commonly classified as succinite when Baltic in origin
gemstone