Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Category
Organic (Non Geological)
Browse organic (non geological) specimens identified by the Rock Identifier community.
Clear Quartz (Cut/Faceted Gemstone)
Silicon Dioxide (SiO2)
gemstone
Gold Grain
Native Gold (Au)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (a plutonic igneous rock)
Igneous
Quartz (White/Milky)
Silicon Dioxide (SiO2)
mineral
Quartz (specifically Clear Quartz or Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (SiO2 primary)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Granite (a common rock type, not a single mineral species)
Igneous
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
Mineral
Chert (Jasper-like)
SiO2 (Cryptocrystalline Quartz)
Sedimentary
Boji Stone (Pop Rocks or Moqui Marbles)
Iron-manganese oxide concretion (Goethite/Hematite/Jarosite)
sedimentary
Fossilized Tabulate Coral (Honeycomb Coral)
Favosites sp. (Order: Tabulata)
fossil
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz Point
Silicon Dioxide (SiO2)
mineral
Gold
Native Gold (Au)
mineral
Banded Iron Formation (Jaspilite)
Banded Iron Formation (BIF); predominantly Hematite (Fe2O3) and Magnetite (Fe3O4) with Chert/Jasper (SiO2)
sedimentary
Ferruginous Sandstone
Arenite with Hematite/Limonite cement
sedimentary
Chert Nodule in Limestone
Microcrystalline Silica (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Glacial Erratic (Sandstone/Quartzite)
Glacial Erratic specimen (likely Orthoquartzite or Feldspathic Sandstone)
sedimentary or metamorphic
Gowganda Tillite (Puddingstone)
Gowganda Formation Conglomerate
sedimentary
Quartz pebble with surface markings
Silicon Dioxide (SiO2)
mineral
Magnetite or Hematite-rich Ore
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Limonite/Goethite Iron Concretion
Hydrated iron oxide-hydroxide mixture (FeO(OH)·nH2O)
mineral
Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Quartz (Gravel)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Black Onyx
Chalcedony (SiO2)
gemstone
White Quartz
Silicon Dioxide (SiO2)
mineral