Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Category
Organic (Biological Organism)
Browse organic (biological organism) specimens identified by the Rock Identifier community.
Dendritic Agate / Moss Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Green Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite
mineral
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with dendritic inclusions
mineral
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Chert (containing small fossils)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Amber
Succinite (fossilized resin)
Organic Mineraloid
Amber (Burmite)
Fossilized tree resin (Succinite variant)
Organic mineraloid
Amber
Succinite (Formula: C10H16O)
Organic Mineraloid
Amber
Succinite (a specific high-quality amber from the Baltic)
Organic Mineraloid
Amber (Butterscotch/Egg Yolk Variety)
Succinite (Approx. C10H16O)
Organic Gemstone
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcedony replacement)
Mineral / Fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxides
mineral
Pickled Dragon Eggs (Fictional Interpretation: Purple Agate or Amethyst Geodes)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Shale with Siltstone layering
Sedimentary Clastic Rock (Mudstone/Shale)
sedimentary
Tufa (Limestone)
Calcareous Tufa (CaCO3)
sedimentary
Gastropod Steinkern (Fossil Snail Internal Mold)
Class Gastropoda (Internal Mold)
sedimentary
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Fossilized Favosites (Honeycomb Coral)
Favosites (Genus), Phylum Cnidaria, Class Anthozoa
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)
Mineral
Amber Inlay Jewelry
Fossilized Resin (C10H16O)
Organic Gemstone (Biogenic)
Amber (Black)
Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)
Mineraloid
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pink Opal
Hydrated silicon dioxide (SiO2·nH2O) with inclusions
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Amber / Copal
Succinite (fossilized resin)
mineraloid
Shale or Siltstone
Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)
sedimentary
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Sand Tiger Shark Tooth
Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)
sedimentary (fossil)
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Wood Beads (Palmwood/Ebony)
Various species for wood, but often refers to woods like Palmwood (e.g., Borassus flabellifer) or Ebony (Diospyros spp.) for their distinctive grain and hardness.
Organic Gem Material (Botanical)
Opalite (a synthetic glass, often confused with Opal)
Silicon dioxide glass (SiO2nH2O, for natural opal)
Synthetic (glass)
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Chert (specifically Flint or Dark Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Black Marble
Recrystallized Calcite (CaCO3)
metamorphic
Moss Agate
Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)
mineral