Petrified Wood
Silicified wood (Quartz/Chalcedony replacement)
fossil
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
Learn about Man Made Material (Simulated Mineral) in the encyclopedia
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Sandstone
Clastic Sedimentary Rock
sedimentary
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Weathered blue-gray calcite/aragonite fragment
Calcium carbonate (CaCO₃), probably calcite; possibly shell-derived aragonite
mineral
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Polished orbicular jasper
Orbicular jasper; microcrystalline quartz (SiO₂) with hematite/goethite and other silicate inclusions
sedimentary
Metallic sulfide ore, likely galena-bearing rock
Galena (lead sulfide, PbS), possibly with pyrite or other sulfides
mineral
Pink chalcedony (likely rough agate/chalcedony)
Microcrystalline quartz, SiO₂; chalcedony variety, possibly iron-bearing
mineral
Sodalite beads
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Quartzite or Quartz Vein Material
SiO2
metamorphic
Banded Ironstone / Jasper Siltstone
Siltstone with Iron Oxide Hydrates (SiO2 with Fe2O3/FeO(OH))
sedimentary
Fossilized Megalodon Tooth Fragment
Otodus megalodon (Carcharocles megalodon fossil)
sedimentary
Quartz (specifically Clear and Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with Calcite or Silica veins)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (specifically Quartz Arenite)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Diamond
C
gemstone
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Tumbled gneiss
Gneiss, chiefly quartz–feldspar with mica and dark ferromagnesian minerals
metamorphic
Dark basalt or basaltic volcanic rock
Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine
igneous
Red Sandstone
Ferruginous Sandstone
sedimentary
Metallic sulfide ore, likely pyrite-bearing rock
Pyrite (FeS₂), possibly with marcasite or other sulfides
mineral
Red-and-cream jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Quartz with Mafic/Chlorite Veins
Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining
metamorphic
Sandstone (Calcareous or Ferruginous)
Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Tumbled black-and-white stone, likely dalmatian jasper
Quartz-rich porphyritic rhyolite (commercially called dalmatian jasper), with black aegirine/arfvedsonite-like inclusions
igneous
Diamond (Emerald Cut)
Carbon (C)
mineral
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Thulite in Matrix
Pink Zoisite - Ca2Al3(SiO4)3(OH)
metamorphic
Likely milky quartz with iron-oxide inclusions
Quartz, silicon dioxide (SiO₂)
mineral
Porphyritic granite or granodiorite
Coarse-grained plutonic rock composed mainly of quartz (SiO₂), feldspar, and mica/amphibole
igneous
Likely weathered basalt or dark volcanic rock
Basalt; primarily plagioclase feldspar and pyroxene, with possible olivine and iron oxides
igneous
Banded Calcite (Mexican Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Red jasper (likely iron-rich chert)
Microcrystalline quartz (SiO₂), colored by hematite/goethite; possibly brecciated jasper
sedimentary