Petrified Wood
Silicified wood, primarily composed of Quartz (SiO2)
Mineral, often found in sedimentary deposits
Category
Mineral (Silicate Replaced Organic Material)
Browse mineral (silicate replaced organic material) specimens identified by the Rock Identifier community.
Pyrite in Shale
Iron Disulfide (FeS2) in Argillaceous Shale
sedimentary
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)
sedimentary
Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)
Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)
Synthetic (Ceramic)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Olivine (often within Peridotite)
Magnesium iron silicate, (Mg,Fe)2SiO4
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Chert (containing Flint nodules)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (White Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Slate
Slate (Foliated metamorphic rock)
metamorphic
Fossilized Megalodon Tooth Fragment
Otodus megalodon (Carcharocles megalodon fossil)
sedimentary
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt
igneous
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variously known as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Tiger's Eye
Tiger's Eye (SiO2 with crocidolite inclusions)
mineral
Amber
Succinite (fossilized resin)
mineral
Sandstone (likely Fossiliferous Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert Nodule
Chert (SiO2)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Chert (often called Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert with Quartz Veining
Silicon Dioxide (SiO2)
sedimentary
Olivine/Peridot
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Olivine (Peridot)
Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Chert (often called Flint in this context)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Slag Glass
Glassy Silicate Residue
industrial byproduct
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Slag
Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)
igneous (artificial/anthropogenic)