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.
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Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Dinosaur Bone
Agatized Dinosaur Bone
sedimentary/fossil
Fossil Shell (Bivalve)
Phylum Mollusca, Class Bivalvia (typically composed of Calcium Carbonate / CaCO3)
sedimentary
Polished fluorite sphere
Fluorite (calcium fluoride, CaF₂)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Olivine
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
mineral
Sandstone
Arenite
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Orange Crackle Quartz
Silicon Dioxide (SiO2) with thermal fracturing
mineral
Blue magnesite beads
Magnesite (MgCO₃), likely stabilized or dyed; brown veining may reflect matrix or iron oxides
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Granite, rich in Potassium Feldspar)
igneous
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
River Pebble (Likely Quartzite or Chalcedony)
Silicon Dioxide (SiO2) - granular metamorphic variety
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
mineral
Diamond
Diamond (carbon allotrope), C (chemical formula)
Mineral
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Aragonite Star Cluster
Aragonite (CaCO3)
mineral
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Pebble / Rounded Rock
Lithic fragment / Water-worn rock
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) fossilized tooth
fossil
Petrified Wood
Silicified Paleoxylon (SiO2)
fossil
Obsidian Arrowhead
Volcanic Glass (SiO2)
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Siliconized Wood (SiO2)
sedimentary
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
Mineral
Turquoise and Red Coral
Turquoise: CuAl6(PO4)4(OH)8·4H2O; Red Coral: Corallium rubrum (organic gemstone)
mineral
Quartz (White Pebble) and Sandstone (Brown/Tan Fragments)
Silicon Dioxide (SiO2) for the white pebble
mineral and sedimentary
Tumbled sodalite with white calcite veining
Sodalite, Na8(Al6Si6O24)Cl2, commonly intergrown with calcite, CaCO3
mineral
Green Quartzite
Silicon Dioxide (SiO2) with mineral inclusions
metamorphic
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
Igneous
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Fossil Shark Teeth (likely Sand Tiger Shark)
Carcharias taurus (fossilized dentition)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Mixed Quartz and Jasper Pebbles
Silicon Dioxide (SiO2)
Mineral
Red Jasper
Silicon dioxide (SiO2) with iron oxide (Fe2O3) inclusions
sedimentary/mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Olivine Weathered Rock (Dunite)
Dunite ((Mg, Fe)2SiO4)
igneous