Quartz Geode (Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Primarily Composed Of Minerals) in the encyclopedia
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Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Vesicular Basalt with Secondary Mineral Inclusions
Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Basalt (Weathered Pebble)
Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene
igneous
Greenstone / Serpentinite
Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn silicate minerals including Antigorite, Lizardite, and Chrysotile)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Ferruginous Sandstone
Arenite with Iron-Oxide Cement
sedimentary
Picture Jasper
Silicified sedimentary or volcanic rock (primarily SiO2)
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Common Opal (Green Opal)
Hydrated Silicon Dioxide (SiO2·nH2O)
mineral
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Limonite Concretion (Ironstone)
Limonite / Goethite (FeO(OH)·nH2O)
sedimentary
Quartz
Quartz (SiO₂)
Mineral
Micaceous Schist
Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Quartzite Pebble (River Rock)
Quartzite (primarily SiO2)
metamorphic
Granite Pegmatite
Phaneritic Plutonic Igneous Rock
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Charoite
Charoite - K(Ca,Na)2Si4O10(OH,F)·H2O
metamorphic
Basalt
Basalt (Mafic Extrusive)
igneous
Wishing Stone with Quartz Vein
Hydrothermal Quartz Vein in Metasedimentary Matrix (primarily SiO2)
metamorphic
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartz-veined Schist (or Metasandstone)
Metamorphic Rock with Quartz Veining (SiO2)
metamorphic
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Rough Sapphire (Corundum)
Corundum (Al2O3)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Rhodonite
Rhodonite; (Mn,Fe,Mg,Ca)SiO3
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Diorite (with Salt-and-Pepper Texture)
Diorite (Intrusive Igneous Rock)
igneous
Ferruginous Sandstone Pebble
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH) staining)
sedimentary
Basalt Pebble with Epidote/Olivine
Vitreous Basalt (SiO2 with Ca/Mg/Fe silicates)
igneous
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Sedimentary
Shale or Mudstone (Based on appearance)
Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)
Sedimentary
Quartz vein in metamorphic rock
Crystalline Silicon Dioxide (SiO2) in Host Rock
metamorphic
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
sedimentary
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
mineral