Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (likely with Borings or Vesicular Basalt)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Travertine (used in construction, not a 'specimen' in situ)
Travertine
Sedimentary
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Red Jasper (Polished)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Basalt with Hematite staining
Extrusive mafic igneous rock with Fe2O3
igneous
Sulfur on Aragonite
Sulfur (S) and Aragonite (CaCO3)
Mineral
Red Jasper
Silicon dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
igneous
Schist (Garnet-Mica Schist)
Garnet-Mica Schist
metamorphic
Tektite (likely Australite)
Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)
Mineral (specifically a mineraloid)
Chalcedony (Botryoidal Agate vein)
Chalcedony (Microcrystalline Quartz) - SiO2
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 principal composition)
sedimentary
Quartz Vein in Schist
Quartz (SiO2) in Mica Schist
metamorphic
Diamond
C (Carbon)
mineral
Granite
Intrusive igneous rock (Acidic)
igneous
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Volcanic Rock) with Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) inclusions
igneous
Quartz with Limonite Staining
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
Mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Granite
Granite (compositionally: Quartz, Feldspar, Mica)
igneous
Yellow Jasper
Silicon Dioxide (SiO2) with goethite/iron oxide inclusions
sedimentary
Agate Geode Slice (with Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Diorite
Phaneritic plutonic rock (dominated by plagioclase feldspar and hornblende)
igneous
Quartz (Variety of Rough Mineral Specimens)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Basalt with vesicles (Amygdaloidal Basalt)
Amygdaloidal Basalt (predominantly Plagioclase and Pyroxene)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Druze (Crystalline Quartz)
Silicon Dioxide (SiO2)
mineral
Clear/White Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Greywacke
Greywacke sandstone
sedimentary
Indigo Gabbro (also known as Mystic Merlinite)
Gabbro (composed of Plagioclase Feldspar, Pyroxene, and minor Magnetite/Ilmenite)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Granitic Pegmatite
Granite (with coarse-grained Quartz, Feldspar, and Mica components)
igneous
Banded Agate
Agate (Silicon Dioxide / SiO2)
mineral
Ferruginous Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary