Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
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
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Blue Sea Glass
Amorphous Silica (Anthropogenic glass)
not a rock (man-made origin)
Pumice
Volcanic glass / Pumiceous rock
igneous
Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)
Silicified limestone or banded sedimentary rock with mineral veins
sedimentary
Smoky Quartz (with possible Feldspar inclusions)
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose type)
Arenite (primarily SiO2)
sedimentary
Rounded reddish-brown river pebble
Indeterminate weathered silicate rock, possibly granite, rhyolite, or iron-stained quartzite
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Emerald in Host Rock
Beryl (Be3Al2Si6O18) containing Chromium and/or Vanadium
mineral
Chert (Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Shale
Laminated Mudstone (Shale)
sedimentary
Moldavite
Tektite (Silicates with aluminum, iron, manganese, and potassium oxide glass)
meteorite
Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Diamond (in Matrix)
Carbon (C)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
mineral
Yellow Quartz (Citrine / Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Marble
Metamorphic Limestone (CaCO3)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxide (Fe2O3) cement
sedimentary
Sandstone
Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)
sedimentary
Quartz Crystal Cluster on Matrix
Silicon Dioxide (SiO2)
mineral
Clear quartz sphere or polished quartz cabochon (tentative)
Quartz, silicon dioxide (SiO₂); appearance may also be consistent with ordinary glass, which cannot be ruled out from the image alone
gemstone
White quartz pebble (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Green Aventurine (Gua Sha tool)
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Picture Jasper
Silicified sedimentary or volcanic rock (primarily SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (Siliclastic sedimentary rock, primarily SiO2)
sedimentary
Iron-stained quartz-rich rock, likely granite or pegmatite fragment
Weathered granite/pegmatite; mainly quartz (SiO₂) with feldspar and iron-oxide staining
igneous
Chert (Holey Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Vein with Iron Staining
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Golden Healer Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Prasiolite (Green Quartz) / Sea Glass Amalgam
SiO2 (Silicon Dioxide)
mineral
Polished blue stone, likely sodalite or dyed agate
Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing
mineral
Likely quartz fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock
mineral
Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly weathered chert or chalcedony
mineral
Banded Slag Glass (Leland Blue/Frankfort Green style)
Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)
mineral
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial purple dye
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary