Quartz (Milky/Crystal variety)
Silicon Dioxide (SiO2)
mineral
Category
Mineral Precipitate (Anthropogenic Context)
Browse mineral precipitate (anthropogenic context) specimens identified by the Rock Identifier community.
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Greenstone
Metabasalt (composed mainly of chlorite, epidote, and actinolite)
metamorphic
Amazonite
Microcline (K(AlSi3O8))
mineral
Limestone with Secondary Mineralization
Calcium Carbonate (CaCO3)
sedimentary
Limonite (Iron Ore)
Limonite (mixed iron hydroxides, primarily FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, FeO(OH)·nH2O)
mineral
Sardonyx Agate Sphere
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
mineral
Turquoise (set in silver jewelry)
Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Moonstone
Orthoclase feldspar ((K,Na)AlSi3O8)
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Serpentinite
Serpentinite
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Marble
Recrystallized Calcite (CaCO3) / Marble
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Rhodonite (Mn2+SiO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Banded Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
Mineral
Red Sandstone
Ferruginous Sandstone (SiO2 dominated with Fe2O3 cement)
sedimentary
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH)
mineral
Rough Ruby
Corundum (Al2O3) with Chromium traces
mineral
Prehnite
Ca2Al2Si3O10(OH)2
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral
Geode (Unopened)
Silicon dioxide with various inclusions (SiO2)
sedimentary
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Lake Superior Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Citrine
Crystalline Quartz (SiO2) with iron impurities
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with chromium/vanadium impurities
mineral
Limonite with Iron Inclusions
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Angelite
Anhydrous Calcium Sulfate (CaSO4)
mineral
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic