Red Sandstone
Arenite (primarily Quartz and Feldspar with Iron Oxide cement)
sedimentary
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
Ocherous Sandstone (Ferruginous Sandstone)
Ferruginous Arenite (SiO2 with Fe2O3)
sedimentary
Metaconglomerate
Metaconglomerate (Quartzite conglomerate)
metamorphic
Synthetic Ruby (Jewel Bearings)
Synthetic Corundum (Al2O3 doped with Chromium)
mineral
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Ferromanganese Nodule
Polymetallic Nodule (composed primarily of MnO2 and Fe2O3)
sedimentary
Chert (with Liesegang Banding)
Microcrystalline quartz (SiO2)
sedimentary
Red Jasper (River Polished)
Jasper (Silicon Dioxide, SiO2)
sedimentary/mineral
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Mineral
Wood Jasper
Siliceous sedimentary rock (variety of Chert/Chalcedony)
Sedimentary
Phyllite
Phyllite
metamorphic
Trilobite Fossil (Flexicalymene)
Flexicalymene ouzregui
sedimentary
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Olivine in Basalt (Peridotite Xenolith)
Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt
igneous
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Red Jasper
Jasper (Silicon Dioxide with Hematite inclusions), SiO2
sedimentary
Pink Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
metamorphic or sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Dyed Crackle Quartz (Green)
Quenching-treated Quartz (Silicon Dioxide, SiO2)
mineral
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Petrified Wood
Silicified wood (Quartz/Chalcedony)
Sedimentary
Porcelain Tile (Sandstone-look)
Man-made Ceramic (resembling Quartz-rich Sandstone)
sedimentary (imitation)
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Bivalve Fossil (Shell Fragment)
Class Bivalvia (Calcium Carbonate - CaCO3)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Metamorphic Rock / Mineral
Chert (Chalcedony/Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Conglomerate
Conglomeratic Sandstone / Sedimentary Breccia
sedimentary
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
River Pebble (Greywacke or Quartzite-rich Sandstone)
Lithic Sandstone (primarily SiO2 with rock fragments)
sedimentary
Quartz
Silicon Dioxide (SiO2)
Mineral
Banded Gneiss
Gneiss (pronounced 'nice')
metamorphic
Clear Quartz (or Rock Crystal)
Quartz (SiO₂)
Mineral
Jasper (Sedimentary variety)
Silicon Dioxide (SiO2) with impurities
sedimentary
Pink Tourmaline in Quartz Matrix
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) with Quartz (SiO2)
mineral
Dragon Blood Jasper
Epidote with Red Piedmontite (Chalcedony/Quartz variant)
sedimentary
Veined Quartz
SiO2 (Silicon Dioxide)
Mineral
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary