Limestone (Micritic)
Sedimentary rock mainly composed of Calcium Carbonate (CaCO3)
sedimentary
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
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Granite
Granite (Phaneritic intrusive igneous rock; primarily SiO2 and Al2O3)
igneous
Sandstone with Ironstone Banding
Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)
sedimentary
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Gneiss
Gneiss
metamorphic
Garnet Schist
Mica Schist with Almandine (Fe3Al2(SiO4)3)
metamorphic
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz
Quartz (SiO₂)
Mineral
Gneiss
Gneiss
metamorphic
Graphite
Graphite (Carbon, C)
Mineral
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
metamorphic
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Hydrothermal Quartz (SiO2) in Slates/Schists
metamorphic
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Fossil Shark Tooth
Squalicorax (likely Squalicorax pristodontus or Squalicorax falcatus)
fossil
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Lapis Lazuli
Sodalite-rich metamorphic rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Granite
Granite (composed primarily of Quartz SiO2, Alkali Feldspar KAlSi3O8, and Plagioclase)
igneous
Gneiss
Gneiss
metamorphic
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
River Stone (Granitic Gneiss)
Foliated Granitic Gneiss
metamorphic
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS) with Quartz (SiO2)
Mineral in a Metamorphic/Hydrothermal rock
Banded Agate (Gray/Brown)
Silicon Dioxide (SiO2)
mineral
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Mineral
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Sandstone (with Iron Staining)
Arenite (primarily SiO2 with Fe2O3/FeO(OH) oxides)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Serpentine
Serpentinite (group of minerals based on (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Garnet Schist
Almandine Garnet in Schist (X3Al2(SiO4)3)
metamorphic
Quartzite
Quartzite (mainly SiO2)
metamorphic
Greenstone / Greenschist
Chlorite schist / Epidiorite
metamorphic
Porphyry (specifically Porphyritic Rhyolite or Andesite)
Porphyritic Igneous Rock (composed of Phenocrysts in an Aphanitic groundmass)
igneous
Granite
Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Granite
Phaneritic plutonic rock (composed of Quartz, Feldspar, and Mica/Amphibole)
igneous