Pyrite
Iron Disulfide (FeS2)
mineral
Category
Sedimentary (Primary) With Artificial Modification
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
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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
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Snow)
Silicon Dioxide (SiO2)
mineral
Dyed Agate
Agate (Silicon Dioxide, SiO2)
Mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Agate (Dyed)
Silicon Dioxide (Chalcedony), SiO2
gemstone
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
Celestite
Celestine (SrSO4)
mineral
Chert (Flint)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Green Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
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
Hematite Rose
Iron Oxide, Fe2O3
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
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
Tumbled quartz-rich pebble
Likely quartz-bearing chert or jasper; primarily microcrystalline SiO₂
mineral
Galena
Lead Sulfide (PbS)
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