Sandstone (Quartzose)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Category
Metamorphic Rock (For Nephrite And Some Jadeite); Mineral (For Jadeite)
Browse metamorphic rock (for nephrite and some jadeite); mineral (for jadeite) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (For Nephrite And Some Jadeite); Mineral (For Jadeite) in the encyclopedia
View all →
Sandstone
Arenite (SiO2 principal component)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Sandstone (Stream-rounded Cobble)
Arenite (composed primarily of SiO2, Silica)
sedimentary
Chert with Quartz Druzy
Microcrystalline Quartz (SiO2) with Drusy Quartz Coating
sedimentary
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Purple Garnet
Magnesium Aluminum Silicate (Pyrope-Almandine series) Mg3Al2(SiO4)3
gemstone
Pink Granite
Granite (Felsic Plutonic Igneous Rock)
igneous
Blue Agate Geode Slice
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Blue Dumortierite Quartz
Dumortierite in Quartz (AlAl6BSi3O12(O,OH)3)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Smoky Quartz (with inclusions)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (SiO2 predominant)
sedimentary
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Limonite Concretion
Goethite/Limonite (FeO(OH)·nH2O)
sedimentary
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Concretion
Septarian Concretion (Clay-Ironstone Nodules)
sedimentary
Agate Geode
Silicon Dioxide (SiO2) - Variety Agate with Quartz crystal center
mineral
Ruby (Raw Corundum)
Corundum (Al2O3:Cr)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Concretion
Calcareous or ferruginous concretion
sedimentary
Red Garnet (Pyrope or Almandine)
Magnesium aluminum silicate (Mg3Al2(SiO4)3) or Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Rhodonite
Rhodonite (MnSiO3)
Mineral
Gneiss
Gneiss
metamorphic
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist, possibly with quartz and feldspar
metamorphic
Fossilized Oyster Shell
Exogyra or Ostrea (Gryphaeidae/Ostreidae family)
fossil
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Garnet-Mica Schist
Garnetiferous Porphyroblastic Schist
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Green Tourmaline
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Geode or Concretion
Silica-based Concretion / Quartz Geode
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Banded Gneiss
Gneiss (pronounced 'nice')
metamorphic
Ferruginous Sandstone
Iron-rich Clastic Sedimentary Rock
sedimentary
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Sandstone
Arenite
sedimentary