Ironstone with Pyrite
Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)
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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Siltstone
Siltstone (Detrital Clastic Sedimentary Rock)
sedimentary
Pegmatite
Igneous Pegmatite
igneous
Chert (specifically Gray/Tan Bedded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Jasper/Iron-stained Quartzite)
Silicon Dioxide (SiO2)
sedimentary
Quartz geode clusters
Microcrystalline quartz (SiO₂), with possible chalcedony and minor iron-oxide staining
mineral
Ferruginous Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Sandstone with Manganese Oxide Patina
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
River-worn Chert
Microcrystalline Quartz (SiO2)
sedimentary
Coal
Carbonaceous sedimentary rock / Lignite to Bituminous coal
sedimentary
Diamond (or Cubic Zirconia simulant)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal)
sedimentary
Chert (Grey-Green Flint)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Red Sandstone
Arenite (Fe2O3-rich)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Iron-rich chert or jasper pebble
Microcrystalline quartz (SiO₂), colored by iron oxides
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide cement
sedimentary
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Quartz with Pyrite and Iron Staining
Silicon Dioxide (SiO2) with Iron Disulfide (FeS2) inclusions
mineral
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Chert (Pebble)
Microcrystalline to Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Iron Formation / Chert with Quartz Veining
Banded Iron Formation (BIF) / Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (with Iron Staining)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
metamorphic
Green Quartzite (Aventurine-like)
Quartzite (primarily SiO2 with chromium-rich mica or chlorite inclusions)
metamorphic
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Tumbled turquoise-like stone
Likely turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Lava Rock (Basalt)
Basalt (extrusive igneous rock)
igneous
Quartzite
Metamorphic rock primarily composed of Quartz (SiO2)
metamorphic
Decorative polished pebbles
Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt
mineral
Basalt
Basalt
igneous
Pink Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral