Moss Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
Category
Browse mineral precipitate (anthropogenic context) specimens identified by the Rock Identifier community.
Moss Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
Green Aventurine
Quartz with fuchsite inclusions (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Amethyst (Faceted)
Silicon Dioxide with Iron impurities (SiO2)
Botryoidal Malachite
Malachite - Cu2CO3(OH)2
Milky Quartz Vein with Iron Staining
Silicon Dioxide (SiO2)
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Druzy Quartz Geode (Oco or Moroccan variety)
Silicon Dioxide (SiO2)
Quartz Druzy Geode
Silicon Dioxide (SiO2)
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
Quartz
Quartz (Silicon Dioxide, SiO2)
Jasper
Jasper (Silicate mineral, SiO2)
Quartz with Arsenopyrite
Silicon Dioxide (SiO2) with Iron Arsenic Sulfide (FeAsS)
Limestone with Calcite Crust
Sedimentary Calcium Carbonate (CaCO3)
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Moss Agate
SiO2 (Cryptocrystalline Quartz)
Desert Rose (Gypsum / Barite Rose)
Hydrated Calcium Sulfate (CaSO4·2H2O) / Barium Sulfate (BaSO4)
Jasper (Green)
Silicon dioxide (SiO2)
Quartzite
Quartzite (primarily SiO2)
Malachite
Malachite (Cu2CO3(OH)2)
Quartz Geode with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
Quartz / Quartzite
Silicon Dioxide (SiO2)
Chert (Septarian Nodules-like)
Silicon dioxide (SiO2)
Blue calcite (probable)
Calcite, calcium carbonate (CaCO₃)
Banded Agate / Chalcedony
Cryptocrystalline Quartz (SiO2)
Honey Calcite
Calcite (Calcium Carbonate, CaCO3)
Ferruginous Quartz
Quartz with Iron Oxide inclusions (SiO2 + Fe2O3)
Carnelian
Carnelian (SiO2 - Silicon Dioxide with Hematite impurities)
Hematite
Hematite (Iron(III) oxide, Fe2O3)
Yellow Chalcedony
Silicon Dioxide (SiO2)
Geode (Unopened Keokuk Geode)
Silicon Dioxide (SiO2) - Chalcedony / Quartz exterior
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in a Geodic Concretion
Limonite (Ironstone)
Limonite (FeO(OH)·nH2O)
Chert or Flint
Silicon dioxide (SiO2)
Chert
Chert (SiO2)
Yellow Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Orange Calcite
Calcium Carbonate (CaCO3)
Blue Calcite
Calcium Carbonate (CaCO3)
Quartz Drusy (on Geode Fragment)
Crystalline Silicon Dioxide (SiO2)
Green Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)