Quartz (Variety: Citrine or Tumbled Chalcedony)
Silicon Dioxide (SiO2)
Category
Browse mineral (specifically, a variety of the mineral species pyrope almandine garnet) specimens identified by the Rock Identifier community.
Quartz (Variety: Citrine or Tumbled Chalcedony)
Silicon Dioxide (SiO2)
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (CaCO3)
Chert (often called Flint)
Chert (Microcrystalline Silicon Dioxide, SiO2)
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
Dyed Dragon Vein Agate
Silicon Dioxide (SiO2) with artificial pigment
Eagle Eye Stone (Green Tiger's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
Jasper with Quartz Vein
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Quartz (Milky/Clear Variety)
Silicon Dioxide (SiO2)
Peridot (Olivine)
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
Ironstone Concretion
Siderite or Hematite Concretion
Serpentine Schist with Quartz Vein
Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).
African Turquoise
African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)
Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)
Silicon Dioxide (SiO2) with iron inclusions
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
Quartz (Pink/Orange Variety)
Silicon Dioxide (SiO2)
Fuchsite
Fuchsite (a variety of Muscovite mica, K(Al,Cr)2(AlSi3O10)(OH)2)
Peridot (Olivine)
Olivine, (Mg,Fe)2SiO4
Botryoidal Chalcedony
Chalcedony (SiO2)
Muscovite Mica
Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2
Quartz (Yellow/Citrine variety)
Crystalline Silicon Dioxide (SiO2)
Banded Agate
Agate (Cryptocrystalline Quartz, SiO2)
Wood Jasper
Siliceous sedimentary rock (variety of Chert/Chalcedony)
Satin Spar (commercially called Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
Milky Quartz (Tumbled)
Quartz (Silicon Dioxide, SiO2)
Yellow Jadeite
NaAlSi2O6 (Sodium Aluminum Silicate)
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt (primarily SiO2, MgO, FeO, and CaO)
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Limonite inclusions
Jasper
Jasper (Silicon Dioxide, SiO2)
Red Jasper (with Quartz inclusions)
Silicon Dioxide (SiO2)
Chert (and Flint)
Silicon Dioxide (SiO2)
Sandstone (Red Sandstone)
Arenite
Calcite (or Alabaster, if truly carved)
Calcium Carbonate (CaCO3)
Citrine Quartz
Silicon Dioxide (SiO2)
Blue Lace Agate (Banded Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Chert (Cherty Limestone / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Blue Calcite
Calcium Carbonate (CaCO3)
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
Citrine Quartz
Citrine (Silicon Dioxide - SiO2)
Magnetic Hematite
Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)