Cubic Zirconia (Set in Jewelry)
Zirconium Dioxide (ZrO2)
gemstone
Category
Metamorphic Or Igneous (Context Dependent)
Browse metamorphic or igneous (context dependent) specimens identified by the Rock Identifier community.
Learn about Metamorphic Or Igneous (Context Dependent) in the encyclopedia
View all →
Chert (Smoky variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Druzy) in host rock
SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)
Mineral
Weathered chert (flint) pebble
Microcrystalline quartz/chalcedony (SiO₂), commonly with iron-oxide staining
sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral, often found as detrital grains in sedimentary rocks
Dark flint or chert fragment
Microcrystalline quartz (SiO₂), likely chert/flint
sedimentary
Ferruginous Slag (Iron Smelting Byproduct)
Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)
Antropogenic Glass / Mineraloid
Weathered conglomeratic sandstone
Polymictic conglomerate or pebbly sandstone, likely iron-stained
sedimentary
Green cabochon gemstone, likely chrysoprase or dyed chalcedony
Chrysoprase: cryptocrystalline quartz (SiO₂), nickel-colored chalcedony; alternatively dyed chalcedony
gemstone
Blue Apatite
Apatite (Group), Ca5(PO4)3(F,Cl,OH)
mineral
Red Jasper
Opaque microcrystalline Quartz (SiO2 with Fe2O3 inclusions)
sedimentary
Flint or chert flake
Microcrystalline quartz (SiO₂), commonly chalcedony with possible impurities
sedimentary
Rounded gray river pebble
Likely quartz-rich metamorphic or igneous pebble; exact identification requires testing
sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Ferruginous Sandstone (Ironstone)
Sandstone with Hematite/Goethite cement (SiO2 + FeO(OH))
sedimentary
Chert (Nodule)
Cryptocrystalline Silica (SiO2)
sedimentary
Weathered, rounded rock (likely metamorphic or igneous)
Undetermined; possibly a quartz- and feldspar-bearing rock
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granite (likely a river or beach pebble)
Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)
Igneous
Baroque Pearl
Calcium Carbonate (Aragonite or Calcite) and Conchiolin
Organic Gemstone
Banded Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Leopard Skin Jasper
SiO2 (Microcrystalline Quartz with inclusions)
mineral
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Magnetite Ore
Magnetite (Fe3O4)
mineral
Weathered quartz-rich stone, likely milky quartz
Quartz (SiO₂), possibly a quartz-rich metamorphic or igneous fragment
mineral
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Diamond
Carbon (C)
gemstone
Ammonite fossil
Ammonoidea (likely an involute ammonite; exact genus requires preparation and context)
fossil
Blue gemstone in a decorative setting (possibly blue spinel or sapphire)
Unidentified blue faceted gemstone; sapphire is corundum (Al₂O₃), while spinel is MgAl₂O₄
gemstone
Chert (often called Flint in this context)
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint in this context)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Magnetite
Magnetite (Fe3O4)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Slag
Anthropogenic Vitrophyre (Iron or Smelting Slag)
Mineral-like byproduct
Bornite
Bornite (Cu5FeS4)
mineral
Gneiss
Gneiss (pronounced 'nice')
Metamorphic Rock
Ferruginous Conglomerate
Ferruginous Conglomerate (Clastic Sedimentary Rock)
sedimentary
Quartz with Epidote
Silicon dioxide (SiO2) with Calcium aluminum iron silicate (Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))
mineral
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Milky quartz crystal cluster
Quartz (silicon dioxide, SiO₂)
mineral