Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Category
Organic Structure (Not A Rock)
Browse organic structure (not a rock) specimens identified by the Rock Identifier community.
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Shell Cameo (Sardonyx Shell)
Cassis madagascariensis (Sardonyx shell)
mineral (biogenic silica/calcium carbonate substrate)
Amber
Succinite (C10H16O)
mineral
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite
mineral
Biological Specimen (Domestic Dog)
Canis lupus familiaris
Organic (Non-rock)
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcedony replacement)
Mineral / Fossil
Pearl
Calcium carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Calcium carbonate (CaCO3) as Aragonite or Calcite
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
sedimentary
Orthoceras Fossil Limestone
Orthoceras (extinct Cephalopod fossil) in Matrix
sedimentary
Coquina / Shelly Limestone
Coquina (Biogenic Limestone)
sedimentary
Paper (Cellulose)
Cellulose (C6H10O5)n
Organic (Anthropogenic)
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Amber
Succinite (Carbon-based organic compound; approximate formula C10H16O)
Mineraloid
Amber
Succinite (C10H16O)
Mineraloid
Fossiliferous Limestone
Limestone (CaCO3 - Calcium Carbonate)
sedimentary
Chert (Basanite / Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Coral Fossil (Scleractinia)
Scleractinia (Order), primarily CaCO3 (Aragonite or Calcite)
sedimentary
Brachiopod Fossil (Spiriferid)
Order Spiriferida (Phylum Brachiopoda); mineralized as Calcite (CaCO3) or Chert (SiO2)
sedimentary (fossilized organic remain)
Amber
Organic gemstone (Succinite)
mineral
Shale (or Mudstone)
Siltstone/Argillite (composed mainly of clay and silt-sized particles)
sedimentary
Chert (Jasper-bearing)
Microcrystalline silica (SiO2) with iron oxide inclusions
sedimentary
Amber
Succinite (Organic Mineraloid)
mineral
Granite
Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Amber
Fossilized Tree Resin (Generic formula roughly C10H16O)
mineral
Chert (often called Flint)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz variant, SiO2)
sedimentary
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Dinosaur Fossil (Skull)
Dinosauria fossilis (Petrified Hydroxyapatite / Calcium Carbonate)
sedimentary
Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)
SiO₂ (silicon dioxide)
Sedimentary
Fossiliferous Limestone (Coral Fossil)
Scleractinian Coral in Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Quartz Sandstone (predominantly)
Sedimentary