Druzy Quartz
Silicon Dioxide (SiO2)
Category
Browse sedimentary or mineral specimens identified by the Rock Identifier community.
Druzy Quartz
Silicon Dioxide (SiO2)
Graphite
Graphite (C)
Aragonite (Flos Ferri)
Calcium Carbonate (CaCO3)
Iceland Spar (Optical Calcite)
Calcite (Calcium Carbonate, CaCO3)
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
Quartz (Milky Variant)
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Green Kyanite
Kyanite (Al2SiO5)
Chalcedony
Chalcedony (SiO2)
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
Carnelian
Carnelian (microcrystalline variety of Quartz, SiO2)
Chalcedony (specifically Agate or Carnelian)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Caribbean Calcite
Calcite and Aragonite (CaCO3)
Clear Quartz Crystal
Silicon Dioxide (SiO2)
Carnelian (Agate)
Silicon Dioxide (SiO2)
Chalcedony (Common Opal variant)
Silicon dioxide (SiO2) with varying levels of hydration
Optical Calcite (Iceland Spar)
Calcium Carbonate (CaCO3)
Sandstone (Quartz-rich)
Arenite (Quartz Arenite)
Hag Stone (Sandstone with Boreholes)
Bored Sandstone (Sedimentary rock with lithophaga-style borings)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Jasper (Chert)
Silicon Dioxide (SiO2)
Jasper
Silicon dioxide (SiO2)
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
Quartz Geode
Silicon Dioxide (SiO2)
Ironstone concretion
Siderite or Limonite concretion (FeCO3 or FeO(OH)·nH2O)
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
Red Jasper
Jasper (Silicon Dioxide, SiO2)
Bivalve Fossil (Internal Mold/Steinkern)
Class Bivalvia (Fossilized Mold)
Geode
Crystalline Quartz (SiO2) within a nodule
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)
Sandstone
Arenite (composed primarily of SiO2)
Sandstone (Quartz Arenite)
Sandstone (Chemical formula: primarily SiO2)
Sandstone (Ferruginous)
Arenite (Fe-rich)
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)