Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sulfur (with possible Cullet Glass or Slag imitation)
Native Sulfur (S8)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
Mineral/Sedimentary
Gold
Native Gold (Au)
mineral
Gold
Native Gold (Au)
mineral
Orbicular Jasper (Ocean Jasper variant)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sodalite Syenite (popularly known as Yooperlite)
Sodalite-rich Syenite (composed of alkali feldspar and sodalite)
Igneous
Porphyry
Porphyritic Igneous Rock (likely Porphyritic Andesite or Basalt)
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Graphic Granite
Graphic Granite (Granite Pegmatite)
igneous
Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
sedimentary
Quartzite Breccia
Brecciated Quartzite (SiO2)
metamorphic
Amethyst Geode
Silicon Dioxide with trace inclusions of Iron (SiO2)
mineral
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Red Quartzite
Quartzite (SiO2 with iron oxide impurities)
metamorphic
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Agate Geode Node
Cryptocrystalline Quartz (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Thunderegg (specifically a Jasper/Agate-filled Geode nodule)
Silicon Dioxide (SiO2) within Rhyolitic Matrix
igneous
Quartz with inclusions (likely Tourmaline or Biotite)
Silicon Dioxide (SiO2)
mineral
Bowling Ball (Brunswick T-Zone Deep Space)
Polyester resin / Polyurethane polymer
Synthetic (not a natural rock)
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
sedimentary
Quartzite (Sugar Quartz)
Quartzite (primarily SiO2)
metamorphic
Quartzite (Beach Pebble)
Quartzite (Composition: SiO2)
metamorphic
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Puddingstone
Polymictic Conglomerate
sedimentary
Yellow Aventurine (or Citrine-colored Quartz)
Silicon Dioxide (SiO2) with inclusions
metamorphic
Scoria (Lava Rock)
Scoria (Vesicular Basalt)
igneous
Malachite and Azurite on Gossan (Ironstone Matrix)
Cu2CO3(OH)2 (Malachite) on FeO(OH)·nH2O (Limonite/Gossan)
mineral
Blue Lace Agate (Tumbled)
Silicon Dioxide (SiO2)
mineral
River Stone (likely Siltstone or fine-grained Basalt)
Clastic Sedimentary (Siltstone) or Mafic Igneous (Basalt)
sedimentary or igneous
Ferruginous Quartz
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3/FeO(OH))
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Lunar Meteorite (Feldspathic Breccia)
Achondrite, Lunar Meteorite (Feldspathic Breccia)
igneous
Quartz Vein in Schist
Quartz (SiO2) in Mica Schist
metamorphic
Gastropod Fossil (Snail Internal Mold)
Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic