Moqui Marble (Shaman Stone)
Iron Oxide Concretion (composed primarily of Quartz sand with Hematite/Goethite shell)
sedimentary
Category
Organic (Paper And Cellulose)
Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
sedimentary
Chert (often referred to as Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Jasper/Flint Pebble)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Precious Coral
Corallium rubrum (Calcium carbonate with trace carotene)
Organic gemstone / Sedimentary mineraloid
Mookaite Jasper
Silicified Radiolarite (SiO2 with iron impurities)
sedimentary
Stardust (Micrometeorite)
Chondrite / Micrometeorite (Extraterrestrial Silicate)
igneous
Gastropod Steinkern (Fossil Snail Internal Mold)
Class Gastropoda (Internal Mold)
sedimentary
Amber
Succinite
Mineraloid
Petrified Wood
Silicified Wood (SiO2 as Quartz/Chert/Chalcedony)
sedimentary
Pyrite in Shale
Iron Sulfide (FeS2) in Argillaceous Shale
sedimentary
Amber
Succinite (fossilized resin)
mineral
Green Moss Agate
Agate (Silicon Dioxide - SiO2 with inclusions of Manganese/Iron oxides)
mineral
Amber
Succinite (Fossilized Tree Resin)
Organic Mineraloid
Amber
Fossilized Resin (C10H16O)
mineral
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary
Aragonite (Star Cluster or Twinned variety)
Aragonite (Calcium Carbonate, CaCO3)
mineral
Amber
Succinicum (C10H16O)
mineral
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Amber
Succinite (specifically for Baltic amber); Complex mixture of organic compounds (C10H16O)
Organic Mineraloid
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Amber
Succinite (fossilized resin, C10H16O)
mineral
Pearl (incorporated into jewelry)
Aragonite and Calcite (CaCO3)
mineral
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Mineral (Organic Gemstone)
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Amber
Amber (Amorphous Organic Hydrocarbon)
mineral
Amber
Succinite
Organic Gemstone (sedimentary associations)
Amber (specifically Red or Cherry Amber)
Succinite (Resinite); Chemical formula: C10H16O
Mineraloid
Fossiliferous Limestone
Limestone (CaCO3 - Calcium Carbonate)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide) with inclusions - SiO2
mineral
Amber
Succinite (C10H16O)
mineraloid
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Shell Cameo (Sardonyx Shell)
Cassis madagascariensis (Sardonyx shell)
mineral (biogenic silica/calcium carbonate substrate)
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Mineraloid
Rough Amber (likely Copal or immature Amber)
Organic gemstone / Succinite (if Baltic)
mineral
Pyrite in Shale
Iron Disulfide (FeS2) in Argillaceous Shale
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe/Chlorite)
mineral
Chert / Flint (with Crinoid Stem Molds)
Microcrystalline Quartz (SiO2)
sedimentary