Silicon Carbide (Carborundum)
Moissanite (SiC), though mostly synthetic
mineral
Category
Sedimentary (Artificial)
Browse sedimentary (artificial) specimens identified by the Rock Identifier community.
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Dyed Agate Slice
Chalcedony (Silicon Dioxide, SiO2) with artificial pigment
mineral
Tumbled turquoise-colored agate or chalcedony
Cryptocrystalline quartz (SiO₂), possibly dyed chalcedony; exact identification requires testing
gemstone
Dyed Agate Geode Slice
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Dyed Blue Agate Slice
Silicon Dioxide (Chalcedony variety), $SiO_2$
gemstone
Dragon Vein Agate (Dyed/Fractured Quartz)
Silicon dioxide (SiO2)
gemstone
Dyed Crackle Quartz (Green)
Quenching-treated Quartz (Silicon Dioxide, SiO2)
mineral
Dragon Vein Agate (Dyed/Treated)
Agate (SiO2)
mineral
Purple Dyed Agate Geode (Banded Chalcedony)
Silicon Dioxide (SiO2) - variety: Agate
mineral
Dyed Agate
Silicon dioxide, SiO2
Mineral (Chalcedony)
Concrete or asphalt-like aggregate surface with a dark fragment
Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock
sedimentary
Dyed Agate
Agate (Silicon Dioxide, SiO2)
Mineral
Tumbled orbicular granite
Orbicular granite, composed mainly of quartz, feldspar, and mica/amphibole
igneous
Obsidian (likely snowflake-free black volcanic glass)
Volcanic glass; predominantly rhyolitic silica melt (SiO₂-rich, noncrystalline)
igneous
Dyed Agate
Chalcedony (SiO2 with impurities)
mineral
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Lemon Quartz
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (Quartz variety), SiO2
mineral
Dyed Coral
Calcium carbonate (CaCO3) - Calcite or Aragonite with dye
organic gemstone
Bismuth Crystal
Bismuth (Bi)
mineral
Dyed Agate
SiO2
Mineral
Dark, rounded rock (possibly basalt)
Undetermined; basalt is a tentative visual identification
igneous
Lemon Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled coral limestone
Biogenic calcarenite/coral limestone, predominantly calcium carbonate (CaCO₃; calcite/aragonite)
sedimentary
Dyed pink tumbled stone, possibly howlite or magnesite
Likely dyed Ca₂B₅SiO₉(OH)₅ (howlite) or MgCO₃ (magnesite); the photo is insufficient for confirmation
mineral
Red Tiger's Eye
SiO2 (Silicon Dioxide) - Pseudomorph of Quartz after Crocidolite
mineral
Dyed pink stone, likely rhodonite or dyed howlite/magnesite
Rhodonite: MnSiO₃; possible howlite: Ca₂B₅SiO₉(OH)₅
mineral
Green cabochon gemstone, likely aventurine or dyed chalcedony
Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony
gemstone
Drill Core Sample
Cylindrical Rock Core (Specific mineralogy varies by extraction site)
Metamorphic (Likely Gneiss or Schist based on texture)
Tumbled quartz-rich pebble
Likely quartz-bearing chert or jasper; primarily microcrystalline SiO₂
mineral
Dyed Agate
SiO2 (Chalcedony/Agate)
mineral
Green Tiger's Eye
Quartz pseudomorph after crocidolite (SiO2)
mineral
Green agate/geode slab
Cryptocrystalline quartz (chalcedony), SiO₂, likely agate with druzy quartz
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Blue quartz (likely tumbled dyed or coated quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Blue-dyed howlite beads (likely)
Howlite, Ca₂B₅SiO₉(OH)₅, commonly dyed blue to imitate turquoise
mineral
Tumbled blue-green chalcedony (likely dyed agate or chrysoprase)
Microcrystalline quartz, SiO₂; chalcedony/agate variety
mineral
Copper-bearing rock, likely bornite/chalcopyrite in iron-rich matrix
Chalcopyrite (CuFeS₂) and/or bornite (Cu₅FeS₄) in limonite/goethite matrix
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Agate (Dyed)
Silicon Dioxide (Chalcedony), SiO2
gemstone
Pink Dyed Agate (Banded Chalcedony)
Silicon dioxide (SiO2) - variety Chalcedony
mineral