Quartz (River Pebble)
Silicon Dioxide (SiO2)
Category
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
Quartz (River Pebble)
Silicon Dioxide (SiO2)
Bauxite
Bauxite (Aluminum Ore)
Chert (Honey Chert or Chalcedony Pebble)
Cryptocrystalline Quartz (SiO2)
Quartz Geode (Cracked)
Crystalline Silicon Dioxide (SiO2)
Quartz (Milk or Clear Variety)
Silicon Dioxide (SiO2)
Wishing Rock (Quartz Vein in Host Rock)
Silicon dioxide (SiO2) vein in various host rocks
Echinoid Fossil (Sea Urchin)
Echinoidea (specifically likely Schizaster or similar genus), calcium carbonate (CaCO3)
Sandstone Concretion
Moqui Marble (Iron-oxide concretion)
River Cobble (likely Basalt or Mafic Igneous Rock)
Extrusive Mafic Igneous Rock (e.g., Basalt)
Acicular Azurite (indicated by deep blue, fibrous/fuzzy appearance)
Azurite (Copper Carbonate Hydroxide) - Cu3(CO3)2(OH)2
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Chert (and Quartzite)
Microcrystalline silica (SiO2)
Sandstone (Ferruginous)
Arenite (Fe-rich)
Quartzite Pebble
Quartzite (SiO2)
Amber / Copal
Succinite (fossilized resin)
Chert (Jasper/Common Chert Pebble)
Microcrystalline Quartz (SiO2)
Quartz
Silicon Dioxide (SiO2)
Blue Quartz (Blue Chalcedony/Dumortierite Quartz)
Silicon Dioxide (SiO2) with inclusions (typically Dumortierite Al7(BO3)(SiO4)3O3)
Chert (River Siltstone/Flint)
Chert (SiO2)
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
Sandstone (with banding/weathering)
Clastic Sedimentary Rock (primarily SiO2)
Sandstone (Quartzite texture)
Clastic sedimentary rock (primarily SiO2)
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
Sandstone (River Pebble)
Arenite (primarily SiO2)
Basalt
Basalt
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Hematite)
Chert (Jasper variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Sandstone (Quartzite-rich Cobble)
Clastic sedimentary rock (primarily SiO2)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Red Sandstone (Old Red Sandstone Pebble)
Arenite with iron oxide (Fe2O3) cement
Sandstone (with potential iron-oxide staining)
Arenite (primarily SiO2)
Blue Chalcedony
Cryptocrystalline Silicon Dioxide (SiO2)
Quartz (Milky/Chalcedony variety)
Silicon Dioxide (SiO2)
Diorite (River Pebble)
Diorite
Chert (Flint)
Microcrystalline Quartz (SiO2)
Chert (Flint variety)
Silicon Dioxide (SiO2)
Quartz
Silicon dioxide (SiO2)
Moqui Marble
Iron Oxide Concretion
Sandstone or Mudstone with Iron Staining
Ferruginous Sandstone/Mudstone
Bauxite
Alumina ore (Mixture of Gibbsite, Boehmite, and Diaspore)