Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Man Made Glass (Not A Natural Rock Or Mineral)
Browse man made glass (not a natural rock or mineral) specimens identified by the Rock Identifier community.
Learn about Man Made Glass (Not A Natural Rock Or Mineral) in the encyclopedia
View all →
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Pink Tumbled Agate
Silicon Dioxide (SiO2) with dye
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pearl (Biogenic)
Nacre / Calcium Carbonate (CaCO3)
mineral
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)
mineral
Sandstone
Arenite
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pearl-and-gemstone insect brooch
Pearl: nacre (aragonite, CaCO₃); colored stones are likely synthetic or natural corundum/spinel/glass, not determinable from the image
gemstone
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 with minor iron oxides)
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone (Quartzite-rich Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Diamond
Natural Diamond (Carbon, C)
gemstone
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Smoky Quartz with Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)
mineral
Dark rounded pebble, likely basalt or slag
Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag
igneous
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
mineral
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Chromium-bearing Fuchsite
mineral
Sandstone
Arenite (primarily SiO2, silica)
sedimentary
Quartz Veined Quartzite or Sandstone
Quartzite with Quartz Veins (SiO2)
sedimentary
Tumbled Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Smoky Quartz (SiO2: Silicon Dioxide)
mineral
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Clear Quartz Point
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Unidentified gray stone
Likely quartz-rich stone; exact identification is not possible from the image
mineral
Quartz pebble in concrete
Quartz (SiO₂), embedded in Portland-cement concrete
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Yellow Quartz (Citrine Quartz or Yellow Jasper)
Silicon Dioxide (SiO2) with iron impurities
mineral