Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Category
Mineral, Often Found As A Rock
Browse mineral, often found as a rock specimens identified by the Rock Identifier community.
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Chert with Quartz Veining
Microcrystalline Silica (SiO2)
sedimentary
Sandstone
Quartz Sandstone (predominantly)
Sedimentary
Fossilized wood (petrified wood)
Silicified wood; commonly quartz/chalcedony (SiO₂) replacing wood tissue
fossil
Porphyritic Basalt or Porphyritic Andesite
Porphyritic Extrusive Igneous Rock
igneous
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Chert (Flint Nodules)
Silicon dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Bauxite
Bauxite (Mixture of Hydrous Aluminum Oxides)
sedimentary
Vesicular Basalt
Vesicular Basalt
igneous
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)
Silicified limestone or banded sedimentary rock with mineral veins
sedimentary
Basalt with Granite Inclusions (Xenoliths)
Mafic igneous rock (Basalt) with Sialic minerals
igneous
Quartz geode or druzy quartz specimen
Quartz, silicon dioxide (SiO₂), likely microcrystalline/drusy quartz coating a host rock
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Shale
Laminated Mudstone (Shale)
sedimentary
Quartz Vein in Basalt or Slate
Hydrothermal quartz vein traversing mafic host rock
metamorphic
Sandstone Pebble with Mineral Encrustation
Quartz Sandstone with Calcite/Halite Crust
sedimentary
Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral
Sandstone (Common Quartz Pebble/Rock)
Sedimentary rock / Quartz arenite
sedimentary
Carnelian Agate
Chalcedony (SiO2 with Iron Oxides)
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Beaded gemstone bracelet, likely lapis lazuli and pale quartz/agate
Lapis lazuli: lazurite-rich rock, chiefly (Na,Ca)₈(AlSiO₄)₆(S,SO)₂; pale beads are uncertain
gemstone
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Chalcedony/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Granodiorite (Weathered)
Granodiorite
igneous
Gossan (with Limonite/Hematite coating)
Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)
sedimentary
Banded Sedimentary Rock
Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands
sedimentary
Chert (specifically Iron-stained River Cobble)
Silicon Dioxide (SiO2)
sedimentary
Druzy Quartz on Chert/Chalcedony
Silicon Dioxide (SiO2)
mineral
Banded Greywacke
Greywacke (Lithic wacke)
sedimentary
Quartzite (Yellow/Tan)
Metamorphic Rock composed of Quartz (SiO₂)
metamorphic
Sandstone (Tumbled/River Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Quartz Vein in Metamorphic Rock
Quartz-veined Schist or Gneiss
metamorphic
Quartz-veined Mudstone or Argillite
SiO2 (Quartz) in Siltstone/Mudstone matrix
sedimentary
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary