Quartz
Silicon dioxide (SiO2)
mineral
Category
Sedimentary (Anthropogenic)
Browse sedimentary (anthropogenic) specimens identified by the Rock Identifier community.
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Chert / Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode in Sedimentary Host Rock
Silicon Dioxide (SiO2) in Carbonate Matrix
sedimentary
Fossil gastropod shell
Gastropoda; species cannot be determined from the image
fossil
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Limestone pebble
Sedimentary carbonate rock (CaCO3)
sedimentary
Stromatolite Fossil
Biogenic sedimentary structure (Stromatolite)
fossil
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone (Tumbled / Rounded)
Sedimentary Rock (Quartz arenite)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Jasper with Hematite Inclusions
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
sedimentary
Limonite (Ironstone Concretion)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Stromatolite Fossil
Biogenic sedimentary structure (Stromatolite)
fossil
Fossiliferous Limestone
Biogenic Sedimentary Rock (CaCO3)
sedimentary
Sandstone Pebble
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Likely weathered sandstone fragment
Sandstone, composed mainly of quartz (SiO₂) and feldspar grains in a clay, silica, or iron-oxide cement
sedimentary
Tumbled brown stone, possibly jasper or weathered chert
Uncertain; likely microcrystalline quartz (SiO₂), potentially iron-stained jasper/chert
mineral
Weathered sandstone
Quartz-rich sandstone, locally iron-oxide stained (SiO₂-dominant)
sedimentary
Sandstone (likely Graywacke or Lithic Arenite)
Clastic sedimentary rock predominantly composed of silicate grains
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Clear quartz (rock crystal)
Quartz, crystalline silicon dioxide (SiO₂)
mineral
Weathered iron-stained sandstone
Quartz-rich sandstone, likely ferruginous (iron-oxide cemented)
sedimentary
Red coral (coral beads)
Precious coral, usually Corallium spp.; composed primarily of calcium carbonate (calcite)
gemstone
Gneiss
Gneiss; a foliated metamorphic rock commonly composed of quartz, feldspar, and mica
metamorphic
Weathered rock fragment (likely limestone)
Calcite-rich limestone, composition and identity uncertain from the image
sedimentary
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Banded gneiss
Gneiss, chiefly quartz–feldspar–mica
metamorphic
Weathered sedimentary rock, likely sandstone
Quartz-rich sandstone (tentative identification)
sedimentary
Brachiopod Fossil in Matrix
Phylum Brachiopoda
fossil
Jasper
Silicon Dioxide (Microcrystalline Quartz)
sedimentary
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Rough Quartz
Silicon Dioxide (SiO2)
mineral
Polished Agate
Silicon dioxide (SiO2)
gemstone
White Howlite
Howlite (Ca2B5SiO9(OH)5)
mineral
Fluorite Bat Carving
Calcium Fluoride (CaF2)
mineral
Jasper
Silicon dioxide (Quartz variety), SiO2
sedimentary
Agate
Silicon Dioxide (SiO2)
sedimentary
Limonite Concretion
FeO(OH)·nH2O
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral