Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Category
Mineral Like Byproduct (Technogenic)
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
Chrysocolla in Matrix
Hydrated copper silicate - (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Soapstone
Steatite (composed primarily of Talc, Mg3Si4O10(OH)2)
metamorphic
Lepidolite on Pegmatite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Granitic Pegmatite
igneous
Serpentine
Serpentine group minerals (e.g., Antigorite, Chrysotile, Lizardite). Chemical formula: (Mg, Fe)₃Si₂O₅(OH)₄
Mineral, often found as a rock (metamorphic)
Raw Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium)
mineral
Yellow Chalcedony (Carnelian/Yellow Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Polychrome Jasper (Desert Jasper)
Silicon Dioxide (SiO2) with iron and mineral inclusions
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Industrial Diamond (Bort or Boart)
Diamond (pure Carbon, C)
mineral
Ruby
Corundum (Al2O3) with Chromium traces
mineral
Smoky Quartz
Smoky Quartz (SiO2)
mineral
Milky Quartz/Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Chalcedony (Tumbled)
Silicon Dioxide (SiO2)
mineral
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Chrysocolla
Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Sandstone
Arenite
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock), primarily SiO2
sedimentary
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Chert Pebble with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Moonstone
Orthoclase (Potassium aluminum silicate - KAlSi3O8)
mineral
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Agate (Chalcedony)
Cryptocrystalline Silica or Silicon Dioxide (SiO2)
mineral
Fire Agate
Chalcedony (Silicon Dioxide, SiO2) with Limonite/Goethite
mineral
Blue Lace Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Iron (Hematite variety)
Iron (Fe) / Hematite (Fe2O3)
mineral
Sunstone
Orthoclase or Oligoclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Chert (specifically Flint or Common Chert)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Schist
Mica Schist
metamorphic
Red Jade (Dyed Quartzite)
Silicon Dioxide (SiO2) - variety Quartzite
metamorphic
Ferruginous Sandstone (Ironstone)
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Specularite (Specular Hematite)
Iron Oxide (Fe2O3)
mineral