Septarian Nodule (Galt)
Calcareous concretion / Septarian concretion
sedimentary
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)
sedimentary
Sandstone (Ferruginous)
Arenite (with iron oxide cement)
sedimentary
Banded Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Granite Glacial Erratic
Intrusive Phaneritic Felsic Rock (Granite)
igneous
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Jasper
Quartz (SiO2) with impurities
sedimentary
Petrified Wood
Silicified Wood (SiO2 - primarily Quartz/Chalcedony/Opal)
Mineral/Fossil (Sedimentary context)
Sandstone (Graywacke type)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Diamond (or Cubic Zirconia imitation)
Carbon (C) - Native Element
mineral
Sandstone (likely Fossiliferous Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Pink Rhodonite
Manganese Silicate (MnSiO3)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Rough Quartz (Grey-Green)
Silicon Dioxide (SiO2)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite - Lithium-rich Mica)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)
igneous
Greisen (Quartz-Muscovite-Turretine Rock)
Greisen
Metamorphic Rock
Pyrite
Iron Sulfide (FeS2)
mineral
Dragon Blood Jasper (Lizard Stone/Septarian Chalcedony)
Epidote with Black Hornblende and White Quartz mixture
metamorphic
Grey Chalcedony (Tumbled)
Chalcedony (SiO2)
mineral
Diamond
Native Carbon (C)
mineral
Ferruginous Siltstone or Mudstone
Ferruginous Siltstone / Goethitic Sandstone
sedimentary
Sandstone
Arenite (primarily SiO2, silica)
sedimentary
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (with banding/weathering)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2 based)
sedimentary
Mahogany Obsidian
Obsidian (Volcanic Glass with Hematite/Magnetite inclusions), SiO2
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Quartzite with Hematite
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Tiger's Eye (Multicolor/Variegated)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxides)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Chert (and its variety Flint)
Silicon Dioxide (SiO2) - Microcrystalline or cryptocrystalline Quartz
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary