Limonitic Sandstone (Stained Sandstone)
Clastic Sedimentary Rock with Iron Oxide (Limonite/Goethite) staining
sedimentary
Category
Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)
Browse mineral like byproduct (often mistaken for igneous rock or meteorite) specimens identified by the Rock Identifier community.
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Halite (Rock Salt)
Halite; NaCl (Sodium Chloride)
Mineral
Basalt
Extrusive mafic igneous rock
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Labradorite
Labradorite (Plagioclase Feldspar Series) - (Ca, Na)(Al, Si)4O8
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Basalt
Mafic volcanic rock (Primarily Plagioclase Feldspar and Pyroxene)
Igneous
Wonderstone (Sandstone)
Liesegang Banded Sandstone (SiO2 dominated)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Granodiorite
Granodiorite (Intermediate plutonic rock)
igneous
Chrome Diopside
Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities
mineral
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Basalt (tumbled/river-worn)
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Basalt (Weathered)
Extrusive Igneous Rock (Mafic composition)
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone (Greywacke)
Arenite / Wacke (Mainly SiO2 with various lithic fragments)
sedimentary
Jasper (specifically Bloodstone/Heliotrope or Dark Green Jasper)
Cryptocrystalline Quartz (SiO2) with inclusions
sedimentary
Carnelian
Carnelian Chalcedony (SiO2 with Iron Oxide impurities)
mineral
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Yellow Chalcedony (Agate/Jasper mix)
Silicon Dioxide (SiO2)
mineral
Travertine
Calcareous Tufa (CaCO3)
sedimentary
Biotite Schist
Biotite Schist (predominantly K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Agate (Thunderegg segment)
Silicon dioxide (SiO2) - Microcrystalline Quartz/Chalcedony
mineral
Mica in Quartz Host
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)
igneous
Pumice
Pumicite
igneous
Garnet Schist
Almandine-Muscovite Schist
metamorphic
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Muscovite Mica
Muscovite: KAl2(AlSi3O10)(OH)2
mineral
Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
sedimentary
Pumice
Pumice (a volcanic glass, primarily SiO2 with Al2O3)
igneous
Dyed Dalmatian Jasper (Dalmatian Stone)
Perthitic Feldspar with Arfvedsonite inclusions
igneous
Serpentine (variety: Serpentine Rock)
Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 primary composition)
sedimentary