Limonitic Sandstone with Inclusion
Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Category
Man Made Composite
Browse man made composite specimens identified by the Rock Identifier community.
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Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite
Granite (a common name for a felsic intrusive igneous rock)
Igneous Rock
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Granite
Granite (Mainly Quartz SiO2, K-Feldspar KAlSi3O8, and Plagioclase)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2 with various lithic fragments)
sedimentary
Quartzite (Iron-stained)
Quartzite (SiO2 with iron oxides)
metamorphic
Sandstone
Arenicola (comprising mostly Quartz, SiO2)
sedimentary
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Chalcedony (Common Opal/Chert variety)
Silicon Dioxide (SiO2)
mineral
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
sedimentary
Granite
Granite (Felsic intrusive igneous rock)
igneous
Iron Meteorite
Iron-nickel alloy (primarily kamacite and taenite)
Mineral/Rock (Extraterrestrial Origin)
Quartzite
Quartzite (primarily SiO2)
metamorphic
Granite
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Banded Gneiss
Gneiss (variable mineral composition)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Black Onyx
Cryptocrystalline Quartz (SiO2) with carbon/iron impurities
mineral/sedimentary
Chrysoprase
Chrysoprase (a variety of Chalcedony, SiO₂)
Mineral
Serpentine
Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)
metamorphic
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz (Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Sandstone
Sandstone (lithified sand)
sedimentary
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Quartz
SiO₂ (Silicon Dioxide)
Mineral
Quartz (likely Milky Quartz or Chalcedony)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Sandstone
Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)
Sedimentary Rock
Jasper (yellow/cream variety)
SiO₂ (Cryptocrystalline Quartz)
Sedimentary
Quartzite
Quartzite (primarily SiO2)
Metamorphic