Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Organic Gemstone (Not A Rock)
Browse organic gemstone (not a rock) specimens identified by the Rock Identifier community.
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Pink Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Red Coral (with Hematite and Black Pearl accents)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
White Coral
Corallium rubrum (biocarbonate calcium) / CaCO3
mineral
Amber
Succinite (a fossilized organic resin)
mineral
Lapis Lazuli
Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2
metamorphic
Lapis Lazuli
Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)
metamorphic
Chert (Cherty Flint/Jasper variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodular)
Chert (SiO2 - Microcrystalline Quartz)
sedimentary
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Turquoise and Spiny Oyster (Heishi style beads)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Spondylus (Spiny Oyster shell)
mineral and organic gemstone
Black Pearl (Tahitian or Irradiated Type)
Organic gemstone (Calcium Carbonate with Conchiolin Binding)
mineraloid
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Amber
Succinite (fossilized resin)
mineral
N/A - Image does not contain a rock or mineral
Anthropogenic textile material
Non-geological
Coal (likely Bituminous or Lignite)
Organic Sedimentary Rock (Carbonaceous)
sedimentary
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Ruby in Fuchsite
Corundum (Al2O3) in Fuchsite (K(Al,Cr)3Si3O10(OH)2)
Mineral
Amber
Succinite
mineral
Natural White Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3
mineraloid
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological
Chert (often called Flint or Jasper)
Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)
sedimentary
Lapis Lazuli
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Pearl (incorporated into jewelry)
Aragonite and Calcite (CaCO3)
mineral
Chert (specifically Tan/Yellow Chert)
Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)
sedimentary
Shale
Fissile Mudstone (Shale)
sedimentary
Pearl
Calcium Carbonate (CaCO3) + Conchiolin
mineral
Chert
Silicon dioxide (SiO2)
Sedimentary
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Pyrite in Shale
Iron Disulfide (FeS2)
mineral
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Note regarding baguette production (not a rock)
Digital text image - Somali language
not a rock
Chert / Flint
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
sedimentary
Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Fossiliferous Limestone (Shell Fragment)
Biogenic Limestone (Calcium Carbonate / CaCO3)
sedimentary
Chert (Jasper/Flint Pebble)
Microcrystalline quartz (SiO2)
sedimentary
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
River Pebble (Siltstone/Mudstone)
Clastic sedimentary rock
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Silica (SiO2)
sedimentary