Pink Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O)
mineral
Category
Organic (Non Rock)
Browse organic (non rock) specimens identified by the Rock Identifier community.
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Lignite (Brown Coal)
Humic Lignite (Carbonaceous sedimentary rock)
sedimentary
Tumbled fossiliferous limestone
Micritic limestone, likely bioclastic/fossiliferous carbonate rock (predominantly CaCO₃)
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pink Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineraloid
Limestone ( weathered ) / Chert Nodular Rock
Sedimentary rock (primarily Calcium Carbonate, CaCO3, with Microcrystalline Quartz, SiO2)
sedimentary
Sandstone (Weathered Coastal Boulder)
Arenite (composed primarily of SiO2)
sedimentary
Shale with Plant Fossils / Carbonaceous Shale
Laminated Mudrock (Siliciclastic)
sedimentary
Amber (Cherry or Red variety)
Succinite (with various trace amounts of organic compounds)
Organic Gemstone (not a rock)
Shale (with minor calcite veining)
Clastic sedimentary rock (primarily clay minerals and quartz)
sedimentary
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Amber
Succinite (specific to Baltic amber), fossilized tree resin
Organic Mineraloid
Amber
Resinite / Fossilized Tree Resin
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Raw Amber / Resin Mineral
Succinite (Fossilized Tree Resin)
gemstone
Fossiliferous limestone (likely ammonite/gastropod-bearing)
Bioclastic limestone; predominantly calcite (CaCO₃)
sedimentary
Amber (Copal)
Succinate (Fossilized Tree Resin)
mineraloid
Amber
Succinite (with empirical formula approximately C10H16O)
Organic Mineraloid
Chert Pebble
Chert (SiO2)
sedimentary
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Amber
Succinite (Formula: C10H16O)
Mineraloid
Shungite
Non-crystalline carbon (Fullerenes)
metamorphic
Fossil Shark Tooth
Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)
fossil
Chert (River Pebble)
Chert (Cryptocrystalline Quartz, SiO₂)
sedimentary
Shungite
Non-crystalline carbon (C)
mineral
Zebra Stone (Banded Chert or Limestone)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions
sedimentary
Graphite
Graphite (Carbon, C)
Mineral
Amber
Succinates (Organic Gemstone)
mineral
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Fossilized wood (petrified wood)
Silicified fossil wood; commonly quartz (SiO₂) replacing wood tissues
fossil
Amber in Matrix
Succinite (Carbon-based organic polymer)
Organic (Sedimentary context)
Petrified Wood
Silicified Wood (SiO2)
fossil
Baroque Pearl
Biogenic Calcium Carbonate (Aragonite/Conchiolin)
mineral
Shungite
Non-crystalline carbonoid (Shungite)
metamorphic
Quartz Veined Basalt
Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)
igneous
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Likely bituminous coal
Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image
sedimentary
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Fossilized Shell Fragment
Invertebrate marine fossil, likely calcium carbonate replacement
fossil
Fossilized bone, likely a large vertebrate limb or rib fragment
Petrified bone; exact taxon indeterminate from the image
fossil
Chert (specifically Flint or Nodular Chert)
Silicon dioxide (SiO2)
sedimentary
Fossilized Shark Tooth (Megalodon or Carcharocles species fragment)
Otodus megalodon / Carcharocles spp. (Apatite / Calcium Phosphate)
fossil