Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Category
Anthropogenic (Man Made Product Subject To Geological Processes)
Browse anthropogenic (man made product subject to geological processes) specimens identified by the Rock Identifier community.
Quartz (Chert/Chalcedony Variety)
Silicon Dioxide (SiO2)
mineral
Chert (variant of Flint)
Chert (SiO2)
Sedimentary
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Milky Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Ferruginous Quartz (Stained Quartz)
Silicon Dioxide (SiO2) with secondary Iron Oxide inclusions (Limonite/Hematite)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
Mineral (Variety of Chalcedony)
Jasper with Iron Staining
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Quartz (Iron-Stained or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2
sedimentary
Pearl (Biogenic Mineral)
Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3
mineral
Chert (and its variety Flint)
Silicon Dioxide (SiO2) - Microcrystalline or cryptocrystalline Quartz
sedimentary
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Ruby Fuchsite / Ruby in Fuchsite
Ruby (Al2O3 variety corundum) and Fuchsite (K(Al,Cr)2AlSi3O10(OH)2 - a chromium-rich variety of muscovite mica) in Quartz matrix
Mineral
Cloudy Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Cherty Shale / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Lava Rock (Scoria)
Scoria (Vesicular Basalt)
igneous
Peridot in Basalt/Xenolith
Olivine (Mg, Fe)2SiO4 in Vesicular Basalt
igneous
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)
Diamond
Carbon (C)
Mineral
Rhodonite
Rhodonite (MnSiO3)
mineral
Phantom Quartz with Chlorite and Hematite inclusions
Silicon Dioxide (SiO2) with inclusions of Chlorite group minerals and Hematite (Fe2O3)
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Iron-stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Sandstone Geode (Ironstone Concretion)
Arenite with Limonite/Hematite matrix (SiO2 with Fe-oxides)
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Fluorite (Green Fluorite)
Fluorite (Calcium Fluoride, CaF2)
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
White Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Sandstone (with Iron Staining)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Amphibolite with Hornblende
Amphibole-rich Metamorphic Rock (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral