Quartz on Limestone
Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)
Mineral on Sedimentary
Category
Mineral Precipitate (Anthropogenic Context)
Browse mineral precipitate (anthropogenic context) specimens identified by the Rock Identifier community.
Learn about Mineral Precipitate (Anthropogenic Context) in the encyclopedia
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Limonite (Ironstone Concretion)
Limonite (Hydrous ferric oxide mixture, FeO(OH)·nH2O)
sedimentary
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar) with inclusions - (Ca, Na)((Al, Si)4O8)
mineral
Green Druzy Quartz (Prasiolite)
Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
Mineral / Sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode
Silicon Dioxide (SiO2) - Crystalline Quartz
mineral
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
sedimentary
Chert (Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Banded Agate (specifically Sardonyx or Black Agate variety)
Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
sedimentary
Ferruginous Sandstone (Gozzanous)
SiO2 (Quartz) with FeO(OH) (Goethite) or Fe2O3 (Hematite) coating
sedimentary
Concretion
Septarian Concretion
sedimentary
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Blue Aragonite
Aragonite (Calcium Carbonate, CaCO3)
mineral
Ocean Jasper or Orbicular Jasper
SiO2
mineral
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Geode (unopened)
Calcedony-lined Geode (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Blue Goldstone
Aventurine Glass (SiO2 with Cobalt/Copper inclusions)
man-made glass
Quartz
Silicon Dioxide (SiO2)
mineral
Geode (unopened nodule)
Silicon Dioxide (SiO2) Nodule
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Cinnabar
Mercury(II) sulfide (HgS)
mineral
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
metamorphic
Chalcedony (Chert/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone with Iron Staining
Clastic sedimentary rock (SiO2 with iron oxides)
sedimentary
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Jasper
Silica (SiO2) with impurities
Sedimentary/Mineral
Limonite (Ironstone Concretion)
Limonite (FeO(OH)·nH2O)
mineral/sedimentary