Citrine
Silicon dioxide (SiO2)
Category
Browse metamorphic, likely sedimentary with quartz veins specimens identified by the Rock Identifier community.
Citrine
Silicon dioxide (SiO2)
Green Aventurine (Green Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
Sandstone Pebble with Iron Staining
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)
Chert (often called Flint or Jasper based on color)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Pyrite (on the right) and Magnetite or Hematite (on the left)
Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)
Blue Onyx (Dyed Agate)
Cryptocrystalline Quartz (SiO2) with artificial pigment
Rhodochrosite
Manganese carbonate (MnCO3)
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
Orange Calcite
Calcium Carbonate (CaCO3)
Chert / Quartz Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Rough Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Quartz Crystal (specifically Rock Crystal)
Silicon Dioxide (SiO2)
Orange Quartz with Epidote
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate hydroxide (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
Sandstone (likely a river or beach pebble)
Sandstone (a clastic sedimentary rock)
Quartz (Amethyst variety)
Silicon Dioxide (SiO2)
Wishing Stone (Graywacke with Quartz Vein)
Graywacke (immature sandstone) with a SiO2 (Quartz) intrusion
Smoky Quartz
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Citrine Quartz
Silicon Dioxide (SiO2)
Sandstone
Arenite (SiO2 based with quartz grains)
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
Quartz
Silicon Dioxide (SiO2)
Epidote in Quartz
Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Milky Quartz (SiO2)
Citrine
Silicon dioxide (SiO2)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Gold Nugget
Native Gold (Au)
Amethyst (Rose de France varieties or Amethystine Quartz)
Silicon Dioxide (SiO2) with iron impurities
Rough Citrine Quartz
Silicon Dioxide (SiO2) with ferric iron impurities
Quartzite
Quartzite (primarily SiO2)
Sandstone (likely Arkosic)
Arenite (SiO2 with KAlSi3O8)
Petrified Wood
Silicified Wood (primarily SiO2)
Pyrite
Iron Disulfide (FeS2)
Pyrite
Iron Sulfide (FeS2)
Pyrite
Iron Sulfide (FeS2)
Pyrite in Quartzite/Graphite Matrix
Iron Sulfide (FeS2)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Pyrite
Iron Sulfide (FeS2)
Orange Calcite
Calcium Carbonate (CaCO3)
Citrine Quartz
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Gold
Native Gold (Au)