Ferruginous Sandstone
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Category
Igneous And Metamorphic Derivative (Weathered)
Browse igneous and metamorphic derivative (weathered) specimens identified by the Rock Identifier community.
Chert Pebble
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossil Rugose Coral (Horn Coral)
Order Rugosa (likely Grewingkia or Heliophyllum species); Calcium Carbonate (CaCO3)
sedimentary
Red Garnet
Almandine and Pyrope (Silicate minerals: Fe3Al2(SiO4)3 and Mg3Al2(SiO4)3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Botryoidal Chalcedony (Desert Rose / Agate)
Silicon Dioxide (SiO₂)
Mineral variant
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
River Cobble (Salt and Pepper Gneiss)
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic
Greenstone
Greenschist-facies basaltic rock
metamorphic
Lapis Lazuli
Na8(Al6Si6O24)S2 (composed primarily of Lazurite, Calcite, and Pyrite)
metamorphic
Garnet-Bearing Gneiss
Almandine-Garnet Gneiss
metamorphic
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Red Jasper (River Pebble)
Silicon Dioxide (SiO2) with hematite impurities
sedimentary (microcrystalline quartz)
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Hematite/Limonite) inclusions
mineral
Greenstone
Greenschist / Greenstone (containing Chlorite, Epidote, Actinolite)
metamorphic
Limonite with Quartz (Gossan)
Hydrated iron(III) oxide-hydroxide mixture (FeO(OH)·nH2O) with Silicon Dioxide (SiO2)
Mineral
Red Sandstone (Old Red Sandstone Pebble)
Arenite with iron oxide (Fe2O3) cement
sedimentary
Chert (Grey Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Fairburn Agate / Agate-bearing Breccia
Cryptocrystalline Quartz (SiO2) within Jasper/Breccia matrix
sedimentary
Limonite Pseudomorph after Pyrite
Limonite (Hydrous iron oxides, FeO(OH)·nH2O) replacing Pyrite (FeS2)
mineral
Lava Stone and Chakra Beads
Basalt (with various mineral/synthetic beads)
igneous
Greenschist with Quartz Veining
Greenschist (commonly containing Chlorite, Actinolite, and Epidote)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Metagabbro / Epidote Gneiss
Epidote bearing Hornblende Gneiss
metamorphic
Mica Schist (with Golden/Biotite inclusions)
K(Mg,Fe)3AlSi3O10(F,OH)2 (Biotite), KAl2(AlSi3O10)(F,OH)2 (Muscovite)
metamorphic
Epidote (Unakite variety)
Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Greenschist (Chlorite Schist)
Greenschist (containing chlorite, actinolite, and epidote)
metamorphic
Granite Gneiss with Garnet
Garnetiferous Gneiss
metamorphic
Clear Quartz (or Rock Crystal)
Quartz (SiO₂)
Mineral
Corundum
Corundum (Al2O3)
Mineral