Peridot
Olivine ((Mg,Fe)2SiO4)
Mineral
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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Gneiss
Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)
metamorphic
Schist
Mica Schist
metamorphic
Amygdaloidal Basalt
Vesicular and Amygdaloidal Basalt
igneous
Sandstone (Ferruginous)
Arenite (with Hematite/Limonite cement)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Agate (specifically, multi-colored or pastel-dyed agate)
Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).
Mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Sandstone with Iron Oxide Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Tumbled or naturally etched mica-rich mineral specimen, likely muscovite
Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly phlogopite mica
mineral
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Tumbled jasper (likely ocean or orbicular jasper)
Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and dark accessory minerals
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert Nodule (Iron-Stained)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Scoria
Vesicular Basalt / Scoriaceous Basalt
igneous
Sandstone (likely Graywacke or Arkose)
Clastic Sedimentary Rock (primarily SiO2 with various lithic fragments)
sedimentary
Nuummite
Nuummite (Ortho-amphibole rock, primarily Anthophyllite and Gedrite)
metamorphic
Sandstone with Iron Oxide Staining
Arenite with Limonite/Hematite alteration
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline quartz (SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone Pebble (River Rock)
Sandstone (Quartz-rich sedimentary rock with iron oxide staining)
sedimentary
Garnet Rhyolite
Rhyolite (high-silica volcanic rock) with almandine/spessartine garnet
igneous
Sandstone (Ferruginous)
Arenite (Fe2O3 staining)
sedimentary
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Basalt
Extrusive Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)
igneous
Dark green metamorphic rock, likely serpentinite
Serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and minor chlorite/talc
metamorphic
Limestone
Sedimentary rock composed primarily of calcium carbonate (CaCO3)
sedimentary
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
N/A - Image is non-geological
Acrylonitrile Butadiene Styrene (ABS) or Polypropylene (PP)
Synthetic material (Plastic/Polymer)
Sandstone (Sedimentary Rock)
Arenite (SiO2 based)
sedimentary
Quartz Pebble with Drusy/Crystalline Pocket
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Arenite (SiO2 dominated)
sedimentary
Coral Fossil
Anthozoa (Scleractinia)
fossil
Yellow Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Diorite
Intermediate Phaneritic Igneous Rock
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Coquina / Fossiliferous Limestone
Calcite-rich Bioclastic Sedimentary Rock (CaCO3)
sedimentary
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (Red Sandstone / River Stone)
Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)
sedimentary