Chert
Microcrystalline quartz (SiO2)
sedimentary
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock (Possibly Composed Of Various Minerals) in the encyclopedia
View all →
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Tumbled Stone Assortment
Various silicate minerals (e.g., Quartz, Feldspar)
mineral
Fossilized Oyster Shell
Ostreidae
fossil
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Sandstone pebble
Sandstone (SiO2 with iron oxides)
sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Polished serpentine (likely green serpentine)
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; composition varies
metamorphic
Sandstone (Weathered Fragment)
Clastic Sedimentary Rock
sedimentary
Ironstone Pebble
Sedimentary ironstone / Hematitic Sandstone
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Cobble
Arenite (primarily SiO2)
sedimentary
Gneiss (specifically a Granitic Gneiss)
Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Ferruginous Sandstone (Ironstone)
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Likely pale quartz or quartzite pebble
Quartz (SiO₂), possibly a quartz-rich rock such as quartzite
mineral
Sandstone
Sandstone (SiO2-rich framework with variable matrix)
sedimentary
Light-colored quartz-rich rock fragment
Possibly milky quartz or quartzite; exact identification is uncertain from the image
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Hag Stone
Perforated Sedimentary Rock (typically Flint, Chert, or Limestone)
sedimentary
Red Sandstone
Arenite (Fe2O3 rich)
sedimentary
Likely banded gneiss
Gneiss, a foliated metamorphic rock composed chiefly of quartz, feldspar, and mica
metamorphic
Small iron-rich rock fragment (possibly hematite or limonite)
Likely iron oxides/hydroxides: hematite (Fe₂O₃) and/or goethite–limonite; identification is uncertain from the image
mineral
Quartz (pebble)
Quartz (SiO₂)
Mineral
Quartz-rich mineral fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz
mineral
Quartz Geode (with Agate banding)
Silicon Dioxide (SiO2)
Sedimentary or Igneous (secondary formation)
Weathered sandstone or iron-rich sedimentary rock
Quartz-rich arenite, possibly ferruginous sandstone
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Light-colored quartz-rich rock (possibly quartzite)
Quartzite, composed predominantly of quartz (SiO₂)
metamorphic
Sandstone
Quartz Arenite
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Mineral Specimens and Streak Test
Various Minerals (Silicates, Carbonates, Oxides)
mineral
Quartz-rich rock, likely granite or quartz-bearing metamorphic rock
Undetermined; possibly granitic rock composed mainly of quartz and feldspar, with mica or other dark minerals
igneous