Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
sedimentary
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Chert / Flint Nodules in Limestone
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
sedimentary
Chert (Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Granite
Granite
igneous
Pyrite in Matrix (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Jet
Lignite (Anthracite-grade compact coal)
sedimentary
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Mineral
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Citrine
Silicon dioxide (SiO2)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and mineral impurities
sedimentary
Black Jasper (Black Onyx substitute)
Silicon Dioxide (SiO2) with carbonaceous impurities
sedimentary (microcrystalline quartz)
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gold (Processed)
Gold (Au)
Metal (Elemental Mineral)
Quartz Vein in Host Rock (Likely Slate or Shale)
Hydrothermal Quartz (SiO2) in Pelitic host rock
metamorphic
Opalite
Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)
mineral
Sandstone (Quartzite-rich Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)
sedimentary
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 with inclusions)
sedimentary
Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Titanium Coated Aura Quartz (Apple Aura Quartz)
Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating
Mineral (Man-modified)
Vesicular Basalt (Scoria)
Basalt (Extrusive Igneous Rock)
igneous
Goldstone (Brown/Gold variety)
Aventurine Glass (SiO2 with Copper inclusions)
Synthetic/Man-made glass (often mistaken for a mineral)
Granite
Granite (Felsic Plutonic Rock)
igneous
Leopard Skin Jasper
Chalcedony (cryptocrystalline Quartz)
Mineral
Schorl (Black Tourmaline)
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Limonite-stained Chert
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Jasper variety) with Iron Oxide staining
Cryptocrystalline Quartz (SiO2) with Goethite/Limonite impurities
sedimentary
Granite
Granite (Felsic intrusive igneous rock)
igneous
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper
Jasper (Silicate Mineral), SiO2 with Fe2O3 inclusions
sedimentary
Amygdaloidal Basalt
Vesicular-Amygdaloidal Basalt (Mafic Extrusive)
igneous
Quartzite River Pebble
Quartzite (primarily SiO2)
metamorphic
Chert (Brecciated or Veined)
Silicon Dioxide (SiO2)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral