Chert (Beach Pebble)
Silicon Dioxide (SiO2)
Category
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
Chert (Beach Pebble)
Silicon Dioxide (SiO2)
Gneiss
Gneiss (a type of metamorphic rock)
Chert (Chert Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Fossilized Coral (Honeycomb Coral)
Favosites (extinct genus of tabulate corals), CaCO3 (Calcium Carbonate)
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
Quartz Pebble
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Eye Agate
Silicon Dioxide (SiO2) with impurities
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with iron oxide inclusions/staining (Limonite/Hematite)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Ferruginous Quartz
Iron-stained Quartz (SiO2 with Fe2O3 impurities)
Quartz with Iron Staining
Silicon Dioxide (SiO2) with FeOx inclusions
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2)
Cubic Zirconia (Simulated Diamond)
Zirconium dioxide (ZrO2)
Agate
Silicon Dioxide (SiO2)
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
Specular Hematite
Hematite (Fe2O3)
Green Apophyllite
Fluorapophyllite-(K), KCa4(Si8O20)(F,OH)·8H2O
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
Rainbow Moonstone with Black Tourmaline
White Labradorite (Feldspar variety, (Na,Ca)(Al,Si)4O8) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
Aquamarine
Beryl (Be3Al2Si6O18)
Quartz
Silicon Dioxide (SiO₂)
Agate (Carnelian/Chalcedony)
Silicon Dioxide (SiO2)
Dyed Alum or Dyed Quartz (Ornamental Crystal)
Silicon Dioxide (SiO2) or Potassium Alum [KAl(SO4)2·12H2O]
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
Tiger's Eye (Nodule/Tumbled)
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
Amethyst (Quartz variety)
Silicon Dioxide (SiO2)
Citrine (Heat-treated)
Silicon Dioxide (SiO2)
Citrine Quartz
Citrine (Silicon Dioxide, SiO2)
Serpentinite (often containing Jadeite/Nephrite)
Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4
Quartz
Silicon dioxide (SiO₂)
Microcrystalline Limestone Pebble
Carbonate sedimentary rock (Calcium Carbonate, CaCO3)
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
Charoite
Charoite (Hydrated potassium, sodium, calcium, barium, strontium silicate hydroxide fluoride)
Serpentinite
Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)
Hypersthene
(Mg,Fe)SiO3 - Enstatite-Ferrosilite series
Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
Orbicular Granite
Orbicular Granidiorite / Plutonic Igneous Rock
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite (SiO2 + Fe2O3)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)