Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Category
Organic (Non Rock)
Browse organic (non rock) specimens identified by the Rock Identifier community.
Learn about Organic (Non Rock) in the encyclopedia
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Fossil bone or tooth fragment
Indeterminate fossilized vertebrate bone/tooth; taxonomic identification is not possible from this blurred image
fossil
Fossil gastropod shell
Fossilized marine gastropod; exact genus/species cannot be determined from the image
fossil
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Limonite after Marcasite (Propeller Conchoid)
Goethite/Limonite pseudomorph after Marcasite (FeO(OH)·nH2O)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Chert (variously identified as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
White mica schist
Muscovite–quartz schist; predominantly muscovite mica (KAl₂(AlSi₃O₁₀)(OH)₂) and quartz (SiO₂)
metamorphic
Limestone with Fossil Fragments
Bioclastic Carbonate Rock (CaCO3)
sedimentary
Sandstone with Brachiopod Mold Fossil
Sedimentary rock (Sandstone) with indeterminate Brachiopod mold
fossil
Chert (Flint variety)
Microcrystalline Silica (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Flint/chert nodule with a weathered cortex
Microcrystalline quartz (SiO₂), likely flint or dark chert
sedimentary
Likely bituminous coal
Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed visually
sedimentary
Petrified wood
Silicified wood, commonly quartz (SiO₂) replacing woody tissue
fossil
Amber
Succinite (a Fossilized Tree Resin); Chemical formula is approximately C10H16O
Organic mineraloid
Amber
Succinite (Carbon-based organic compound; approximate formula C10H16O)
Mineraloid
Petrified Wood
Silicified Wood (SiO2)
fossil
Amber
Fossilized Tree Resin (Generic formula roughly C10H16O)
mineral
Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Sandstone (with Moss)
Quartz Arenite / Sandstone
sedimentary
Weathered flint or chert fragment
Microcrystalline quartz (SiO₂), likely chert/flint
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Quartz vein in host rock
Milky quartz (SiO₂) with likely metamorphic country rock, possibly gneiss or schist
metamorphic
Baltic Amber
Succinite (Polmerized conifer resin)
mineraloid
Obsidian
Volcanic Glass (Mainly SiO2)
igneous
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Amber
Succinite (a specific common type) or Fossilized Tree Resin (C10H16O)
Mineraloid
Greenstone pebble (likely altered basalt or serpentine)
Greenschist-facies mafic rock; commonly chlorite–actinolite–epidote ± serpentine
metamorphic
Probable rough basalt or mafic igneous fragment
Fine-grained basalt, likely plagioclase–pyroxene–olivine aggregate
igneous
Limestone (Karst formation)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 composed primarily of quartz)
sedimentary
Chert
Silicon dioxide (SiO2)
Sedimentary
Coal (Anthracite or Bituminous)
Carbonaceous sedimentary rock (Carbon)
sedimentary
Gneiss Pebble
Gneiss
metamorphic
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Sandstone
Sandstone (Siliciclastic Sedimentary Rock)
sedimentary
Fossiliferous Limestone (Shell Fragment)
Biogenic Limestone (Calcium Carbonate / CaCO3)
sedimentary
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic