Sandstone with Iron Oxide Staining
Arenite with Limonite/Hematite alteration
sedimentary
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
Learn about Mineral Description (Anthropogenic Material) in the encyclopedia
View all →
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Chert Concretion
Microcrystalline Quartz (SiO2)
sedimentary
Citrine
Silicon dioxide (SiO2)
mineral
Brecciated jasper/chert
Microcrystalline quartz (SiO₂), with iron-oxide and clay inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Blue Quartzite
Quartzite (primarily SiO2) with inclusions like Dumortierite or Crocidolite
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Blue Quartzite (Aventurine variety)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite
metamorphic
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Ruby (Raw/Rough)
Corundum (Al2O3 with Chromium trace)
mineral
Turquoise
Hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Chert with Quartz Veining
Silicon Dioxide (SiO2)
sedimentary
Siltstone (Yellow/Brown Sandstone or Siltstone)
Siltstone / Fine-grained Sandstone (rich in iron oxides like limonite)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Petrified Coral Fossil
Rugose or Tabulate Coral (Hexagonaria or similar fossilized cnidarian)
fossil
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Turquoise in Matrix
Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Gravel (Crushed Stone Aggregates)
Mixed Siliciclastic / Carbonate Aggregate
sedimentary
Porphyritic rhyolite (likely lithophysal/vesicular rhyolite)
Rhyolite; chiefly quartz and alkali feldspar, with minor plagioclase and iron-bearing minerals
igneous
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Iron-stained quartz-rich rock, possibly jasper/quartzite
Quartz (SiO₂) with iron-oxide staining; likely ferruginous quartzite or jasper
metamorphic
Quartz-bearing metamorphic rock, possibly epidote/quartzite
Quartz-rich rock with possible epidote and feldspar; exact identification requires testing
metamorphic
Fossilized oyster shell in limestone
Bivalvia fossil; chiefly calcite (CaCO₃)
fossil
Fuchsite-bearing Quartzite (Green Quartzite)
Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartzite
metamorphic
Granite
Phaneritic Acidic Igneous Rock (Granite)
igneous
Probable serpentinite (serpentine-rich rock)
Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with possible magnetite and olivine remnants
metamorphic
Sandstone (likely Graywacke or Lithic Sandstone)
Clastic Sedimentary Rock
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Quartz Conglomerate
Quartz Conglomerate (clastic sedimentary rock)
sedimentary
Quartz (Gravel fragment)
Quartz (Silicon Dioxide, SiO2)
mineral