Milky quartz (rough quartz crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
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Goldstone (blue-goldstone–style glass) beads
Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral
mineral
Jasper (Green Jasper / Chert)
Silicon Dioxide (SiO2 with inclusions)
mineral
Goldstone
Avventurina (Man-made Glass with Copper inclusions)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Sandstone
Arenite
sedimentary
Rose Quartz and Lepidolite in Pegmatite
Crystalline Silicon Dioxide (SiO2) with Lithium-rich Mica (K(Li,Al)3(Al,Si)4O10(F,OH)2)
igneous
Yellow Chert or Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Marble
Metamorphosed Limestone (CaCO3)
metamorphic
Banded Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (varietal Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Green aventurine quartzite (likely)
Quartz-rich metamorphic rock; predominantly microcrystalline quartz (SiO₂), with possible fuchsite, chlorite, or epidote
metamorphic
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)
sedimentary
Weathered granite or granitic gneiss pebble
Granite; mainly quartz (SiO₂), feldspar, and mica, with possible gneissic alteration
igneous
Pink Granite
Granite (Felsic intrusive igneous rock)
igneous
Chrysocolla-rich copper ore
Chrysocolla, a hydrated copper aluminosilicate (approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), possibly mixed with malachite or turquoise-group minerals
mineral
Polished ammonite fossil
Ammonoidea (likely a Jurassic or Cretaceous ammonite), preserved in limestone/mudstone
fossil
Polished/tumbled jasper, likely ocean jasper or brecciated jasper
Jasper: microcrystalline quartz (SiO₂) with iron oxides and other silicate impurities
mineral
Petrified Wood
Silicified wood (SiO2 - Silicon Dioxide)
sedimentary
Sandstone (Red)
Arenite (Fe2O3 heavy)
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Staurolite-bearing mica schist (probable)
Mica schist composed chiefly of muscovite/biotite, quartz, and likely staurolite or garnet
metamorphic
Black Sapphire (Basaltic Blue Sapphire)
Corundum (Al2O3)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Milky Quartz
Silicon dioxide (SiO2)
mineral
Chert (often called Flint)
Microcrystalline to cryptocrystalline quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with high iron oxide content)
sedimentary
Sandstone (Ferruginous/Red Sandstone)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O
igneous
Polished jasper/chalcedony pebble
Microcrystalline quartz (SiO₂), likely brecciated or iron-stained jasper
mineral
Tumbled dark pebble
Indeterminate; likely basalt or fine-grained dark metamorphic rock
mineral
Dyed or treated turquoise-like tumbled stone
Likely turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O), though blue-green magnesite or howlite imitation is possible
mineral
Blue-green fluorite crystal
Fluorite (calcium fluoride, CaF₂)
mineral
Tourmalinated quartz sphere
Quartz (SiO₂) with black schorl tourmaline inclusions
mineral