Sandstone
Arenite (SiO2 primarily)
Category
Browse this is not a rock or mineral specimens identified by the Rock Identifier community.
Sandstone
Arenite (SiO2 primarily)
Sandstone (Quartz-rich)
Arenite (composed mainly of SiO2)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Milky Quartz with Chlorite/Amphibite Inclusions
Silicon Dioxide (SiO2) with various mineral inclusions
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Basalt (River Rock)
Basalt
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
Granite
Granite
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
Amygdaloidal Rhyolite
Amygdaloidal felsic extrusive rock
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
Quartz (Druzy/Macro-crystalline)
Silicon Dioxide (SiO2)
Geode (Unopened)
Chalcedony Geode (Hydrated Silicon Dioxide, SiO2)
Gneiss with Quartz Vein
Gneiss containing Quartz (SiO2) filler
Geode (unopened)
SiO2 - Chert-shelled concretion (mostly Quartz)
Rose Quartz (or Quartzite)
Silicon Dioxide (SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
Diorite
Intermediate plutonic igneous rock
Basalt (with possible alteration or lichen)
Mafic volcanic rock (primarily Plagioclase and Pyroxene)
Agate
Agatized Chalcedony (SiO2)
Rough Sapphire (Corundum)
Corundum (Al2O3)
Labradorite (Feldspar)
Labradorite, (Ca,Na)(Al,Si)4O8
Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
Blue Sapphire
Corundum (Al2O3)
Jasper
Jasper (SiO2)
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
Sandstone (Pebble)
Arenite (primarily SiO2)
Banded Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Gneiss
Gneiss
Chert
Silicon dioxide (SiO2)
Granite
Granite (Felsic Plutonic Rock)
Sandstone (Ferruginous)
Arenite (complex silicate composition with iron oxides)
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
Granite
Granite (a felsic intrusive igneous rock)
Sandstone (Pebble)
Arenite / Clastic Sedimentary Rock
Granite
Granite (Phaneritic igneous rock)
Sandstone
Arenite (SiO2 based)
Jasper
Jasper (Silicon Dioxide, SiO2)
Sandstone
Arenite (composed primarily of SiO2)