Sandstone (with Moss)
Quartz Arenite / Sandstone
sedimentary
Category
Organic (Paper And Cellulose)
Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.
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Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Amber
Organic gemstone (Succinite)
mineral
Fossiliferous Limestone
Fossiliferous Limestone
sedimentary
Fossiliferous Limestone
Limestone with embedded fossil cross-section
sedimentary
Chert (Flint Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Amber (Copal)
Succinite (fossilized tree resin)
mineral
Pearl
Calcium carbonate (CaCO3) + organic conchiolin
gemstone
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin (CaCO3)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (Formula: C10H16O)
Organic Mineraloid
Amber
Succinite (a variety of fossilized tree resin); chemical formula appx. C10H16O
mineraloid
Sea Shell (Mollusk Shell)
Calcium Carbonate (Aragonite/Calcite)
fossil
Limestone with Gastropod Fossil
Sedimentary Calcium Carbonate (CaCO3) with Gastropoda inclusion
fossil
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Coal
Coal (Sedimentary Rock / Organic Rock)
sedimentary
Garden Quartz (Lodolite / Inclusion Quartz)
Quartz with inclusions (SiO2 with various mineral inclusions)
gemstone
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Agatized or Silicified Fossil/Coral, or Jasper
SiO2
sedimentary
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
gemstone
Freshwater Pearl
Aragonite / Biogenic Calcium Carbonate (CaCO3)
mineral
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Asphalt
Asphalt concrete
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth
Carcharocles or Otodus sp. (Micro-fossilized)
sedimentary
Shungite
Carbon-rich mineraloid (Amorphous carbon)
mineral
Onyx (Black) and Mother of Pearl Inlay
Silicon Dioxide (SiO2) for Onyx; Aragonite (CaCO3) for Mother of Pearl
mineral
Amber
Succinite
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Siderite Concretion in Shale
Iron carbonate (FeCO3) in Mudstone/Shale matrix
sedimentary
Fossiliferous Kalkstein (Marl/Sandstone)
Fossiliferous calcarenite/siltstone
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Jasper
Silicon dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock
sedimentary
Pearl
Nacre (Aragonite and Conchiolin), CaCO3
mineral
Chert (often called Flint)
Chert (SiO2)
sedimentary
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary