Quartz
Quartz (SiO2 - Silicon Dioxide)
Category
Browse sedimentary (jasper), mineral (aquamarine) specimens identified by the Rock Identifier community.
Quartz
Quartz (SiO2 - Silicon Dioxide)
Celestine (or Celestite)
Strontium sulfate (SrSO4)
Sandstone Beach Pebble
Clastic sedimentary rock (SiO2 with iron oxide cement)
Fossil Shark Tooth (Cretaceous white shark type)
Squalicorax (commonly known as Crow Shark)
Concretion
Septarian concretion (likely containing Calcite or Siderite)
Fossiliferous Limestone
Limestone (CaCO3 - Calcium Carbonate)
Sandstone
Arenite (primarily SiO2)
Quartz (Druzy Quartz)
Silicon Dioxide (SiO2)
Potassium Feldspar (Orthoclase)
KAlSi3O8
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Septarian Nodule
Septarian Concretion (Complex of Calcite, Aragonite, and Limestone/Mudstone)
Ironstone Concretion
Siderite or Ferruginous Concretion (FeCO3 or Iron Oxides)
Asphalt Concrete (Bituminous Concrete)
Bituminous aggregate
Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
Sandstone (Greywacke/Siltstone variant)
Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
Bauxite
Bauxite (Principal ore of aluminum; mixture of minerals including Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
Fluorite
Fluorite (Calcium Fluoride, CaF2)
Travertine (Tufa)
Chemical Sedimentary Limestone (CaCO3)
Pyrite
Iron Sulfide (FeS2)
Chalcedony (Yellow/Honey variety)
Microcrystalline Quartz (SiO2)
Red Hematite
Iron(III) oxide (Fe2O3)
Calcite
Calcium Carbonate (CaCO3)
Ferruginous Quartz
Silicon Dioxide with Hematite/Limonite inclusions (SiO2 + Fe2O3)
Pyrite
Iron Disulfide (FeS2)
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
Aragonite Star Cluster
Aragonite (Calcium Carbonate - CaCO3)
Pyrite (Cube variety)
Iron Sulfide (FeS2)
Dendritic Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
Quartz
Silicon Dioxide (SiO2)
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Hematite (Iron Ore)
Hematite (Fe2O3)
Pyrite
Iron Disulfide (FeS2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
Pyrite
Iron Disulfide (FeS2)
Sandstone (Ferruginous)
Arenite (Fe-rich)
Sandstone (likely Quartzite-grade)
Arenite (primarily SiO2)