Petrified Wood
Silicified Wood (SiO2)
fossil
Category
Anthropogenic (Man Made Material Processed By Nature)
Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.
Learn about Anthropogenic (Man Made Material Processed By Nature) in the encyclopedia
View all →
Rhodonite Tumbled Chips
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Jasper (specifically Chert or Orbicular Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz Vein in Metamorphic Rock
Silicon Dioxide (SiO2) within Metasedimentary host
metamorphic
Agate and Chalcedony Beads
Cryptocrystalline Quartz (SiO2)
gemstone
Quartzite Pebbles
Quartzite (SiO2)
metamorphic
Iron Meteorite (likely an Individual specimen)
Iron Meteorite (Group IAB, IIAB, IIIAB, etc., Fe-Ni alloy)
igneous
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Zebra Jasper
Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Limestone (River Stone)
Calcium Carbonate (CaCO3)
sedimentary
Fossil Coral
Rugosa or Tabulata coral fossil (Calcium Carbonate, CaCO3)
fossil
Weathered iron-rich sandstone or laterite
Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides such as hematite and goethite
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Fossilized Wood (Petrified Wood)
Agatized wood (primarily SiO2)
fossil
Petrified Wood
Silicified wood (SiO2)
fossil
Red Jasper
Jasper (Silicon Dioxide with Iron inclusions - SiO2)
Sedimentary/Metamorphic
Peridotite
Peridotite (varieties include Dunite, Lherzolite, Harzburgite)
igneous
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Porphyry
Porphyritic Igneous Rock
igneous
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Biotite Schist
Biotite Schist (Rich in K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Ruby in Kyanite
Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)
metamorphic
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Tumbled rhodonite
Rhodonite, manganese inosilicate (MnSiO₃), commonly mixed with quartz and manganese oxides
metamorphic
Conglomerate
Conglomerate
Sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2 + Fe2O3
sedimentary
Quartzite
Metamorphosed Sandstone (primarily SiO2)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheets with Quartz)
metamorphic
Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary