Quartz
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock (Possibly Composed Of Various Minerals) in the encyclopedia
View all →
Quartz with Magnetite or Schorl inclusion
Silicon Dioxide (SiO2) with Fe3O4 or NaFe3(Al6)(BO3)3Si6O18(OH)4
metamorphic
Puddingstone
Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)
Sedimentary
Likely vesicular basalt (scoria)
Basaltic volcanic rock, chiefly plagioclase, pyroxene, and possibly olivine
igneous
Jasper
Quartz (SiO2)
sedimentary
Quartz Drusy on Matrix
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Sandstone (Iron Oxide Rich)
sedimentary
Blue Quartz (or Blue Aventurine)
Silicon Dioxide (SiO2) with inclusions (typically Crocidolite or Dumortierite)
mineral
Pink Granite
Phaneritic Plutonic Igneous Rock (composed of K-feldspar, Quartz, and Mica)
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode (partially formed/chalcedony with iron staining)
Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides
Mineral/Sedimentary Rock Feature
Possibly tumbled dark stone or mineral specimen
Indeterminate from image; possibly black tourmaline, basalt, or another dark silicate
mineral
Weathered limestone
Calcite-rich limestone (CaCO₃), possibly fossiliferous or dolomitic
sedimentary
Quartz in Matrix (possibly with Biotite or Hornblende)
Quartz (Silicon Dioxide, SiO2) in Granitic Matrix
igneous
Pink Quartz / Rose Quartz
Silicon Dioxide (SiO2)
mineral
Painted Rock
Weathered Sedimentary Rock (Painted)
sedimentary
Quartz (likely)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Coal (Bituminous / Anthracite)
Carbonaceous Sedimentary Rock (C)
sedimentary
Mixed Gemstone and Mineral Collection
Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite or arkose)
sedimentary
River Stones (Quartzite and Sandstone)
Quartzite / Sedimentary Rock (SiO2 dominant)
sedimentary
Slate
Foliated Metamorphic Rock (composed mainly of Quartz, Illite, and Chlorite)
metamorphic
Lapis Lazuli (Tumbled Stone)
Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (Lazulite-rich Metamorphic Rock)
metamorphic
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Quartz Druzy
Silicon Dioxide (SiO2)
mineral
Gabbro (likely with Pyrite/Sulfide mineralization)
Mafic Intrusive Igneous Rock
igneous
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Tumbled quartz-rich rock, possibly jasperized quartz or quartzite
Quartz (SiO₂), likely with iron-oxide staining and minor feldspar or other silicate minerals; exact identification is uncertain from the photograph
metamorphic
Sandstone (with Iron Staining)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Granite
Intrusive igneous rock
igneous
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Quartz
Silicon Dioxide (SiO₂)
Mineral
Breccia Pebble
Sedimentary Breccia
sedimentary
Limonite or Ironstone
Hydrated iron oxide-hydroxide, approximately FeO(OH)·n(H2O)
mineral
Quartz Geode/Vug in Host Rock
SiO2 (Silicon Dioxide) in various host rocks
mineral
Quartz Geode Segment
Crystalline Silicon Dioxide (SiO2)
mineral