Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Category
Anthropogenic Material (Man Made Rock)
Browse anthropogenic material (man made rock) specimens identified by the Rock Identifier community.
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Schist
Mica Schist
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Chert (Gray Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt (Fine-grained extrusive igneous rock)
igneous
Chert (Jasper/Quartzite variety)
Microcrystalline Silica (SiO2)
sedimentary
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Pumice
Pumice (a highly vesicular volcanic rock)
igneous
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Granite
Granite (composed mainly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Sandstone (Graywacke type)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Chert / Flint Nodules in Sandstone
Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock
sedimentary
Sandstone (Ferruginous/Red Sandstone)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Breccia
Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Ferruginous Sandstone
Arenite with Iron-Oxide cement (primarily Fe2O3 • nH2O)
sedimentary
Serpentinite
Serpentinite (composed mainly of Group: Serpentine; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Granite (Weathered)
Course-grained Intrusive Igneous Rock
igneous
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Jasper and Chert Conglomerate
Ferruginous Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (Quartz-rich)
Arenite (SiO2 based)
sedimentary
Rhyolitic Tuff (Breccia Type)
Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)
igneous
Chert (Yellow Jasper/Flint)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (likely Ferruginous)
Arenite (SiO2 based with Fe2O3/FeO(OH) cement)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Red Sandstone
Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)
sedimentary
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz)
sedimentary
Greenstone
Metabasalt (Greenstone Facies)
metamorphic
Chert (Chert / Flint)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Basalt (Water-worn pebble)
Basalt (Aphanitic mafic volcanic rock)
igneous
Chert (often referred to as 'Jasper' when red)
Chert (microcrystalline quartz, SiO₂)
Sedimentary rock
Red Sandstone (Iron-rich Sandstone)
Clastic Sedimentary Rock - Quartz Arenite / Arkose with Hematite Cement
sedimentary
Coal (Bituminous)
Organic sedimentary rock primarily consisting of carbon (C)
sedimentary
Granite Pebble
Felsic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
igneous