Pyrite
Iron Disulfide (FeS2)
mineral
Category
Sedimentary And Igneous (Mixed)
Browse sedimentary and igneous (mixed) specimens identified by the Rock Identifier community.
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Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Hematite
Iron (III) Oxide (Fe2O3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz Pebble with Iron Inclusions
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Quartz Cobble (with Iron Oxide Staining)
Microcrystalline to Macro crystalline Quartz (SiO2)
sedimentary
Jasper-Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Coquina or Fossiliferous Sandstone
Fossiliferous Calcarenite (CaCO3 with SiO2 inclusions)
sedimentary
Sandstone with Liesegang Rings
Arenite with Iron Oxide Liesegang Banding
sedimentary
Rounded granitic cobble
Granite or granitic gneiss; primarily quartz, feldspar, and mica
igneous
Polished orbicular granite (likely larvikite or orbicular diorite)
Quartz/feldspar-bearing granitoid with dark amphibole–biotite minerals; exact variety requires testing
igneous
Vesicular volcanic scoria (likely basaltic scoria)
Scoria; predominantly iron- and magnesium-rich silicate glass with plagioclase, pyroxene, and possible olivine
igneous
Weathered porphyritic volcanic rock
Likely altered andesite or rhyolite porphyry
igneous
Granite (Dioritic or Hornblende-rich)
Phaneritic Plutonic Felsic to Intermediate Igneous Rock
igneous
Red Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Quartz
Silicon Dioxide (SiO₂)
Mineral
Pearl
Pearl; primarily aragonite (CaCO₃) in nacre
gemstone
Carved quartz skull, likely smoky quartz or gray chalcedony
Silicon dioxide (SiO₂), quartz or microcrystalline quartz
gemstone
Banded Gneiss
Gneiss
metamorphic
Gneiss (Metamorphic Pebble)
Gneiss (SiO2-rich metamorphic rock)
metamorphic
Quartz (with Sandstone/Quartzite rocks)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Metamorphic Gneiss (High-grade regional metamorphism specimen)
metamorphic
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Quartz (Grain)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Greenschist
Chlorite Schist
metamorphic
Milky Quartz
Silicon dioxide (SiO2)
mineral
Orange Calcite
Calcite (CaCO3)
Mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)
metamorphic
Quartz Druze on Matrix (Geode Fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Gneiss (High-Grade Metamorphic Rock)
Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral