Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
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Chert (Jasper/Mudstone variant)
Silicon Dioxide (SiO2)
sedimentary
Chert (containing Flint nodules)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Amethyst-bearing quartz fragment
Quartz, SiO₂, with purple amethyst coloration; likely attached to a green matrix mineral
mineral
Granite-like igneous rock
Likely medium-grained granite or granodiorite; quartz–feldspar–mica aggregate
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral
Cowrie shell
Marine gastropod shell; likely a cowrie (family Cypraeidae), species not identifiable from the image
fossil
Sandstone
Clastic Sedimentary Rock
sedimentary
Polished ocean jasper (likely orbicular jasper)
Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and other silicates
mineral
Serpentinite (often called Jade or Nephrite substitute)
Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)
metamorphic
Sandstone
Arenite (SiO2 based typically)
sedimentary
Pumice
Pumiceous volcanic glass
igneous
Polished Ocean Jasper
Orbicular jasper, microcrystalline quartz (SiO₂) with iron oxides and accessory minerals
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Generic Rock / Pebble
Undetermined rock specimen
sedimentary
Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)
Silicified limestone or banded sedimentary rock with mineral veins
sedimentary
Scoria
Scoria (vesicular basalt-andesite)
igneous
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Sandstone with Dendritic Inclusions
Quartzose Sandstone
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Polished Ocean Jasper cabochon
Orbicular chalcedony (microcrystalline quartz, SiO₂), commonly with feldspar, zeolites, and iron-oxide inclusions
mineral
Dark gray rock fragment
Indeterminate from image; possibly weathered basalt or fine-grained metamorphic rock
rock
Stromatolite
Biogenic sedimentary rock
sedimentary
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
metamorphic
Orbicular jasper (orbicular chert/jasper)
Silica-rich microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions
sedimentary
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Tumbled gray-green chalcedony
Microcrystalline quartz (SiO₂), likely chalcedony or quartz-rich river pebble
mineral
Weathered agate or chalcedony nodule
Microcrystalline quartz (SiO₂), likely agate/chalcedony with iron-oxide staining
mineral
Lava Rock (Basaltic Scoria)
Vesicular Basalt
igneous
Dyed and polished agate pebble
Microcrystalline quartz (SiO₂), likely chalcedony/agate with blue dye
mineral
Quartzite (River Stone)
Quartzite (SiO2)
metamorphic
Schist (with Iron Oxide)
Mica Schist
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Sandstone (SiO2-dominated clastic rock)
sedimentary
Garnetiferous Pegmatite
Pegmatite with Almandine Garnet and Muscovite
igneous
Quartz-bearing dark rock, possibly hornfels or basalt
Probable quartz–feldspar rock; exact identification requires testing
metamorphic
Granite Pegmatite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Quartz geode
Quartz (SiO₂), likely chalcedony-lined geode with drusy quartz crystals
mineral
Quartz Geode
Crystalline Quartz (SiO2) within a sedimentary or volcanic host
mineral