Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
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Quartzite
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Soapstone
Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)
Metamorphic Rock
Sandstone
Arenite
sedimentary
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Eclogite
Eclogite (composed primarily of Omphacite and Pyrope Garnet)
metamorphic
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Granite Gneiss
Granitic Gneiss
Metamorphic
Wishing Stone with Quartz Veins
Quartzite or Quartz-veined Metamorphic Rock (composed mainly of SiO2)
metamorphic
Quartzite (River Pebble)
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Marble
Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)
metamorphic
Red Sandstone
Arenite (primarily Quartz and Iron Oxide)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock
igneous
Basalt
Basalt (primarily composed of Plagioclase Feldspar and Pyroxene)
igneous
Laterite
Laterite (no specific mineral formula as it's a rock type)
Sedimentary
Serpentine
Serpentinite (composed primarily of Mg3Si2O5(OH)4)
metamorphic
Bauxite
Alumina ore (Mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Vesicular Basalt
Basalt (Mafic volcanic rock)
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Schist
Mica Schist (primarily composed of quartz, feldspar, and mica)
metamorphic
Quartzite (River Pebble)
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Granite (Pink/Red Granite)
Phaneritic Felsic Igneous Rock
igneous
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Sandstone (Iron-stained)
Arenite (primarily Quartz, SiO2)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Greenstone (Amygdaloidal Basalt)
Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)
igneous
Greenstone (Epidote/Chlorite Rich Rock)
Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))
metamorphic
Serpentine Jade (New Jade/Olive Jade)
Serpentinite (a rock composed primarily of serpentine minerals) / Mg3Si2O5(OH)4 for Antigorite and Lizardite
Mineral
Gneiss (Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Quartz (pebble)
Quartz (SiO₂)
Mineral
Sandstone (likely Quartzose Sandstone pebble)
Arenite (primarily SiO2)
sedimentary
Seashell Fragment
Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite
mineral