Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Category
Synthetic (Not A Rock Or Mineral)
Browse synthetic (not a rock or mineral) specimens identified by the Rock Identifier community.
Granite
Granite (a plutonic rock)
Igneous
Biotite Schist
Biotite Schist (Rich in K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Sandstone (Banded)
Clastic Sedimentary Rock: Arenite
sedimentary
Note regarding image quality
Indeterminate
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Quartz in Basalt (Xenocryst)
Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock
Igneous
Vesicular Basalt with Quartz/Chalcedony
Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)
igneous
Quartz Vein in Schist
Quartz (SiO2) in Mica Schist
metamorphic
Basalt with Quartz Veining
Basalt (Mafic Extrusive Igneous Rock) with SiO2 (Silicon Dioxide) veins
igneous
Quartz-Veined Mudstone
Argillaceous Mudstone with Quartz Veining
sedimentary
Clear Quartz
Silicon dioxide (SiO2)
mineral
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Lapis Lazuli
Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Agate Geode
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Ferruginous Sandstone (Ironstone)
Arenite with Limonite/Goethite cement
sedimentary
Unidentifiable Rock Fragment
Uncertain
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Sandstone (with Iron concretions/staining)
Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)
sedimentary
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Sandstone (lithic/greywacke variant)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Granite
Plutonic felsic igneous rock
igneous
Basalt River Cobble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Sandstone with Magnetite and Iron Staining
Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Anyolite (Ruby in Zoisite)
Zoisite with inclusions of Hornblende and Ruby (Ca2Al3(SiO4)3(OH))
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite and Calcite inclusions
igneous
N/A (The provided image is a storyboard/digital document)
N/A
Botryoidal Chalcedony (Desert Rose / Agate)
Silicon Dioxide (SiO₂)
Mineral variant
Shale
Lutaceous sedimentary rock
sedimentary
Unakite
Unakite (altered granitic rock)
metamorphic
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Granite
Granite (a common igneous rock)
igneous
Basalt with Scoria
Amygdaloidal Basalt / Vesicular Basalt
igneous
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
mineral