Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Category
Organic Mineral
Browse organic mineral specimens identified by the Rock Identifier community.
Learn about Organic Mineral in the encyclopedia
View all →
Shale
Fissile Clay-dominant Mudrock (SiO2, Al2O3, K2O, Na2O, CaO, MgO)
sedimentary
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Petrified Wood
Silicified wood (Quartz, SiO2)
fossil
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (with Quartz veins)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Flint variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified wood (principally SiO2)
sedimentary
Chert with Weathered Rind (Flint/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often found as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amber
Resinite (Succinite if from the Baltic); Chemical Formula: C10H16O (approximate)
Organic Diamond/Gemstone (often associated with Sedimentary sequences)
Shale
Mudrock / Fissile Shale
sedimentary
Petrified Wood
Silicified Wood (Permineralized organic matter, głównie $SiO_2$)
fossil
White seed-bead gemstone strand, likely freshwater pearl or shell pearl
Pearl: nacreous calcium carbonate, chiefly aragonite (CaCO₃) in conchiolin; identification uncertain from image
gemstone
Slate
Metamorphic Mudstone / Shale
metamorphic
Amber
Succinite (Carbon-based organic compound; approximate formula C10H16O)
Mineraloid
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (chemical formula: C10H16O)
Organic Gemstone (not a rock or mineral)
Pickled Dragon Eggs (Fictional Interpretation: Purple Agate or Amethyst Geodes)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Fossilized Megalodon Tooth Fragment
Otodus megalodon (Carcharocles megalodon fossil)
sedimentary
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
mineral
Chert (often associated with Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Bivalve Fossil (Brachiopod or Scallop)
Class Bivalvia (or potentially Phylum Brachiopoda)
fossil
Moqui Marble (Shaman Stone)
Ironstone Concretion (Goethite/Hematite Shell)
sedimentary
Chert (Yellow and Red Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Eroded)
Carcharodon sp. or Otodus sp. fragment (likely)
fossil
Sand Tiger Shark Tooth (Fossil)
Carcharias taurus (fossilized dentin/enameloid)
fossil
Chert (White-Tan variety)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Coral
Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)
sedimentary
Ironstone Concretion
Siderite or Goethite Concretion
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Flint variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (and/or River Pebble)
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Bone
Fossilized Vertebrate Bone (Per mineralized)
fossil
Chert (River Pebble)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Black Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary