Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Category
Sedimentary Rock (Specifically A Clastic Sedimentary Rock Formed Into A Cobble)
Browse sedimentary rock (specifically a clastic sedimentary rock formed into a cobble) specimens identified by the Rock Identifier community.
Schist (Micaceous Schist)
Schist (containing mainly Muscovite and Quartz)
metamorphic
Fluorite (likely Green Fluorite variant)
Calcium Fluoride (CaF2)
mineral
Chert (Arrowhead or Projectile Point)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Fossilized Coral
Scleractinian Anthozoa (Fossilized Calcium Carbonate, CaCO3)
sedimentary
Chert (or Flint)
Chert (Sedimentary Cryptocrystalline Sio2)
sedimentary
Quartz (likely a form of massive or vein quartz)
Quartz (SiO₂)
Mineral
Epidote (Unakite variety)
Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Quartz Druze (on Matrix)
Silicon Dioxide (SiO2)
mineral
Chert (containing Flint nodules)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone (with Coralline Inclusions)
Calcium Carbonate (CaCO3)
sedimentary
Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Agate (various color varieties)
SiO₂ (Silicon Dioxide)
Mineral (specifically a variety of Chalcedony, which is a microcrystalline quartz)
Orbicular Rhyolite (Rainforest Jasper)
Rhyolite containing Spherulites (SiO2 with impurities)
igneous
Coquina
Bioclastic Limestone
sedimentary
Fossiliferous Limestone (Coquina / Shell Conglomerate)
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with Iron Oxide impurities
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide with impurities (SiO2)
Mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions
sedimentary
Chert (and associated Flint)
Silicon Dioxide (SiO2)
sedimentary
Coal (Anthracite)
Anthracite (Carbon-based organic sedimentary/metamorphic rock)
metamorphic
Ferruginous Sandstone
Sandstone, Iron-rich
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)
mineral
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Chert (Quartz Pebble)
Silicon Dioxide (SiO2)
sedimentary
Fossil Coral
Fossilized Scleractinia or Tabulata (various genera/species)
Sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Mookaite Jasper
Radiolarite (Silica, SiO2)
sedimentary
Larvikite
Monzonite (intermediate intrusive igneous rock containing plagioclase, alkali feldspar, augite, and biotite)
igneous
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Coquina / Shelly Limestone
Bioclastic Limestone (composed of CaCO3)
sedimentary
Black Jasper
Silicon Dioxide (SiO2) with inclusions
sedimentary
Oolitic Limestone
Oolitic Carbonate (CaCO3)
sedimentary