Quartz Pebble (Citrine-colored or Stained Quartz)
Silicon Dioxide (SiO2)
Category
Browse sedimentary rock (possibly conglomerate or breccia with a quartz vein) specimens identified by the Rock Identifier community.
Quartz Pebble (Citrine-colored or Stained Quartz)
Silicon Dioxide (SiO2)
River Chalcedony / Agate
Chalcedony (Silicon Dioxide, SiO2)
Sandstone (Pebble)
Sandstone (arenite, arkose, wacke depending on composition)
Epidote with Magnetite/Hematite inclusions
Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')
Calcium Carbonate (CaCO3)
Gneiss (specifically Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)
Petrified Wood
Silicified Wood (SiO2)
Chert (and Limestone) River Cobble
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
Quartz Geode in Chert/Limestone Matrix
Silicon Dioxide (SiO2) within Sedimentary Host Rock
Carnelian
Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)
Gneiss (Metamorphic Rock)
Gneiss
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2)
Herkimer Diamond in Matrix
Quartz (SiO2) in Dolostone (CaMg(CO3)2)
Sandstone
Arenite (primarily SiO2)
Jasper
Silicon dioxide / Chalcedony (SiO2)
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
Quartzite
Quartzite (primarily composed of SiO O₂)
River Pebble (Quartz-rich)
Silicon Dioxide (SiO2) with various inclusions
Quartz / Chert
Silicon Dioxide (SiO2)
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
Sandstone
Sandstone (clastic sedimentary rock, composed predominantly of sand-sized minerals or rock fragments)
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
Ferruginous Sandstone Pebble
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH) staining)
Turquoise in Matrix
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
Sandstone
Sandstone (principally SiO2)
Chert / Flint
Microcrystalline Quartz (SiO2)
Geode with Quartz and Chalcedony
Silicon Dioxide (SiO2)
Quartz (Milky/Iron-stained)
Silicon Dioxide (SiO2)
Sandstone
Arenite (primarily SiO2)
Jasper
Silicon dioxide (SiO2) with iron impurities
Limestone with Calcite
Sedimentary Calcium Carbonate (CaCO3)
Chert (Limestone-based)
Silicon Dioxide (SiO2)
Dalmatian Stone
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
Black Veined Jasper (Spiderweb Jasper)
Silicon Dioxide (SiO2)
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
Gneiss
Gneiss
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
Gneiss (Granite Gneiss)
Gneiss
Hematite
Iron(III) oxide (Fe2O3)
Chert (Flint)
Silicon Dioxide (SiO2)