Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
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Mammoth Tooth
Mammuthus primigenius (Tooth fragment)
fossil
Vesicular volcanic scoria (likely weathered basaltic scoria)
Scoria; chiefly vesicular basalt, composed mainly of plagioclase, pyroxene, and iron-rich glass
igneous
Limonite (Ironstone)
Limonite (mixture of hydrated iron(III) oxide-hydroxides)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled blue-green stone, likely chrysocolla-bearing jasper
Chrysocolla-rich chalcedony/jasper; commonly a mixture of chrysocolla (hydrated copper silicate, variable formula) and quartz (SiO₂)
mineral
Unidentified dark pebble
Undetermined; possibly polished basalt, chert, or iron-rich stone
mineral
Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
mineral
Petrified Wood
Silicified Wood (primarily Quartz or Chalcedony, SiO2)
mineral
Sandstone/Quartzite
Sedimentary Rock (composed mainly of SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Raw greenish-blue quartz-bearing mineral specimen
Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests
mineral
Chert / Flint
Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂
Mineral
Quartz-rich breccia or quartzite with iron-oxide veining
Microcrystalline to granular SiO₂ (quartz), with hematite/goethite and minor feldspar or mica
metamorphic
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Banded Chert (likely Flint or Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Black Obsidian (Faceted)
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
N/A - Image is non-geological
Acrylonitrile Butadiene Styrene (ABS) or Polypropylene (PP)
Synthetic material (Plastic/Polymer)
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Rough Quartz (Alluvial Pebbles)
Silicon Dioxide (SiO2)
mineral
Likely porphyritic igneous rock (possibly granite or rhyolite)
Quartz–feldspar–mica aggregate; exact identification requires a fresh surface and tests
igneous
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Shark Tooth Fossil
Selachii fossil
fossil
Fossil Shell (Bivalve)
Phylum Mollusca, Class Bivalvia
fossil
Fossil Seashell
Invertebrate fossil (Bivalvia)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class) - likely Carcharodon or Otodus genus
fossil
Fossil Shark Tooth (Sand Tiger Shark type)
Carcharias sp. (likely Odontaspis)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Fossilized Brachiopod
Phylum Brachiopoda (replaced by Calcite/CaCO3)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Fancy Jasper
Jasper (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Banded Siltstone
Banded Siltstone / Laminated Siltstone
sedimentary
Milky quartz-bearing rock, possibly quartzite
Quartz (SiO₂), likely in a quartzite or quartz-rich metamorphic matrix
metamorphic
Rough Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
gemstone
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Iron Slag
Ferrous Slag (Silicate/Oxide mixture)
industrial byproduct (anthropogenic)
Graphic Granite
Pegmatitic Granite (Quartz and Microcline K-Feldspar mixture)
igneous