Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Category
Organic (Non Rock)
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Amber
Resinite (Succinite if from the Baltic); Chemical Formula: C10H16O (approximate)
Organic Diamond/Gemstone (often associated with Sedimentary sequences)
Chert (Green Fossilized Algae or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Coal (likely Bituminous or Lignite)
Organic Sedimentary Rock (Carbonaceous)
sedimentary
Sandstone with Brachiopod Mold Fossil
Sedimentary rock (Sandstone) with indeterminate Brachiopod mold
fossil
Limestone (Karst formation)
Calcium Carbonate (CaCO3)
sedimentary
Shungite
Non-crystalline carbon (Fullerenes / Carbon-60)
metamorphic
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Melo Melo Pearl (or Golden Chalcedony / Yellow Jasper Sphere)
Non-nacreous calcium carbonate pearl (or SiO2 - Silicon Dioxide)
gemstone
Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Amber
Succinite (C10H16O)
gemstone
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amber
Succinite (specific to Baltic amber), fossilized tree resin
mineraloid
Weathered dark flint (chert) pebble
Microcrystalline quartz (SiO₂), commonly called flint or chert
sedimentary
Obsidian
Volcanic Glass (Mainly SiO2)
igneous
Amber
Succinite (Fossilized Tree Resin)
gemstone
Gneiss Pebble
Gneiss
metamorphic
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Fossiliferous Limestone
Carbonate Rock (CaCO3 with organic inclusions)
sedimentary
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Shale
Lutaceous sedimentary rock
sedimentary
Black Limestone
Bituminous Limestone (Calcium Carbonate - CaCO3)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Amber (Dark/Black Variety)
Succinite (Resinite), C10H16O
mineral
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Shale
Shale (clastic sedimentary rock composed of silt and clay-sized particles)
sedimentary
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Pink Opal
Hydrated silicon dioxide (SiO2·nH2O) with inclusions
mineral
Amber
Fossilized Tree Resin
gemstone
Baltic Amber (Black)
Succinite (Fossilized Tree Resin)
fossil
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Moss-covered Rock Fragment
Weathered Rock Fragment with Epilithic Growth
sedimentary
Sandstone (with Moss)
Quartz Arenite / Sandstone
sedimentary
Borosilicate Glass (Manufactured)
SiO2 + B2O3 (Silicon dioxide and Boron trioxide)
Synthetic/Amorphous Solid
Amber
Succinite (a Fossilized Tree Resin); Chemical formula is approximately C10H16O
Organic mineraloid