Quartz (Milky/Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Rock Or Mineral (Depending On Origin And Purity)
Browse sedimentary rock or mineral (depending on origin and purity) specimens identified by the Rock Identifier community.
Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Sandstone
Arenite (primarily SiO2 with trace Fe2O3)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Shale
Shale (Lutite)
sedimentary
Gold Ore
Auriferous Quartz and Sulfide Mineralization in Host Rock
igneous
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Black Onyx
Silicon dioxide (SiO2) - Chalcedony variety
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Kyanite in Quartz
Al2SiO5 in SiO2
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Graphite
Graphite (Native Carbon, C)
metamorphic
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Quartzite with Iron Inclusions
Metamorphic Quartzite (SiO2 with Fe2O3 trace impurities)
metamorphic
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Gold Nugget
Native Gold (Au)
mineral
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Fossilized Sand Tiger Shark Tooth
Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)
sedimentary (fossil)
Blue Kyanite
Kyanite (Al2SiO5)
Mineral
Yellow Quartz (Citrine/Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (Gravel fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Jasper
Silicon Dioxide (SiO2)
Mineral
Banded Gneiss (with possible weathered sulfide or iron staining)
Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides
Metamorphic
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Mineral
Limestone (Concretionary or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Rhodonite, Gray Moonstone, and White Feldspar Mix
Multiple: MnSiO3 (Rhodonite), (K,Na)AlSi3O8 (Feldspar/Moonstone)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Calamites (Fossil)
Calamites sp. (Tracheophyta, Equisetopsida)
sedimentary
Pearl
Calcium Carbonate (CaCO3) in the form of orthorhombic Aragonite and Conchiolin
mineral
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Slate
Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.
sedimentary
Fossilized Megalodon Tooth Fragment
Otodus megalodon (Carcharocles megalodon fossil)
sedimentary
Drill Core Sample
Cylindrical Rock Core (Specific mineralogy varies by extraction site)
Metamorphic (Likely Gneiss or Schist based on texture)
River Cobble (Quartzite with Iron Staining)
Metamorphic Quartzite (SiO2 with Fe2O3 inclusions)
metamorphic
Smoky Quartz (Vein Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (SiO2 dominant)
sedimentary
Nephrite Jade (or Serpentine)
Nephrite (a variety of amphibole mineral tremolite-actinolite) or Serpentine Group minerals
Mineral/Rock
Botryoidal Chalcedony (likely Chert or Agatized Coral)
Silicon Dioxide (SiO2)
mineral
Quartz with Chalcedony
Silicon dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood / Chalcedony (SiO2)
sedimentary
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary