Yellow Quartzite (River Cobble)
Quartzite (mainly SiO2)
metamorphic
Category
Organic Material (Likely A Fruit Or Berry)
Browse organic material (likely a fruit or berry) specimens identified by the Rock Identifier community.
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Garnet (likely Almandine or Pyrope)
Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)
Mineral
Porphyritic Basalt
Amygdaloidal Porphyritic Basalt
Igneous
Chert (Pink Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Asphalt / Bituminous Aggregate
Bituminous mixture (Hydrocarbon-based sediment)
sedimentary
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with iron oxide and other mineral impurities
sedimentary (chemical/biological origin)
Chert (Jasper influence)
Microcrystalline Quartz (SiO2)
sedimentary
Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar)
igneous
Amber
Succinite
Organic Gemstone (sedimentary associations)
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Gastropod Steinkern (Fossil Snail Internal Mold)
Class Gastropoda (Internal Mold)
sedimentary
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Moss Agate
Chalcedony (Silicon Dioxide) with inclusions - SiO2
mineral
Pyrite in Shale
Iron Disulfide (FeS2) in Argillaceous Shale
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite
mineral
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Blue Goldstone
Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)
man-made glass
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Amber
Succinite (specifically for Baltic amber); Complex mixture of organic compounds (C10H16O)
Organic Mineraloid
Amber
Succinite (Formula: C10H16O)
Mineraloid
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Diamond (in Jewelry Setting)
Carbon (C) - Isometric-Hexoctahedral
mineral
Limestone (Concretionary or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Fieldstone/Pebble)
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone with Quartz Inclusions
Clastic Sedimentary Rock (Iron-rich Sandstone)
sedimentary
Granite with Orthoclase and Hematite Staining
Phaneritic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)
igneous
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
Sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert / Flint Conglomerate
Silicified Sedimentary Breccia (primarily SiO2)
sedimentary
Fossiliferous Limestone
Bioclastic Limestone (composition: CaCO3)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chrysanthemum Stone
Celestine (SrSO4) or Calcite (CaCO3) in Limestone/Porphyry matrix
metamorphic
Agatized Petrified Wood
Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood
metamorphic
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Ironstone Concretion / Limonite Node
Goethite and Limonite (FeO(OH) nH2O)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary