Quartz
Silicon Dioxide (SiO2)
Mineral
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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Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Banded Sandstone (Liesegang Rings)
Sedimentary sandstone with Iron oxide precipitates
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz
sedimentary
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Chalky Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Agate (Chert/Chalcedony)
Cryptocrystalline Quartz (SiO2)
sedimentary
Calcite
Calcite (CaCO3)
Mineral
Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Oolite (Ooid)
Oolitic Limestone (chiefly CaCO3)
sedimentary
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Sedimentary Rock
Jasper with Quartz inclusion
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert with Calcite Veining
Microcrystalline Quartz (SiO2) with Calcium Carbonate (CaCO3) veins
sedimentary
Quartz Geode
Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell
sedimentary
Turquoise
Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)
Mineral
Polished River Jasper
Silicon Dioxide (SiO2) with iron and other mineral inclusions
sedimentary
Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Anthropogenic (Man-made)
Cobalt Blue Sea Glass
Amorphous Silica Glass (SiO2 + CoO)
mineraloid / anthropogenic material
Iron Slag
Ferrous Slag (complex silicate and oxide byproduct)
industrial byproduct (anthropogenic)
Jasper and Quartz River Pebble
Silicon Dioxide (SiO2) with impurities
sedimentary
Ferrous Slag
Fused calcium-iron silicates (Industrial Slag)
Anthropogenic/Industrial byproduct
Iron Slag
Iron smelting byproduct (Glassy/vesicular silicate)
anthropogenic / industrial byproduct
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Ferro-Manganese Slag
Vitreous Silicate Slag
Anthropogenic (Industrial byproduct)
Quartz
SiO₂ (Silicon Dioxide)
Mineral
Lake Superior Agate
Cryptocrystalline Quartz (SiO2) with Iron impurities
mineral
Moqui Marble
Ironstone Concretion (Goethite/Hematite)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Chalcedony (Microcrystalline Quartz) - SiO2
sedimentary or metamorphic
Oolitic Limestone
Oolite (Sedimentary rock composed of CaCO3)
sedimentary
Black Limestone with Calcite Veining
Bituminous Limestone (CaCO3 with Organic Carbon inclusions)
sedimentary
Quartz-veined Greywacke
Lithic Wacke with Siliceous Veins
sedimentary
Quartz Druzy on Basalt
Silicon Dioxide (SiO2) on Mafic Volcanic Rock
Mineral on Igneous Rock
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper and Quartz River Cobble
Silicon Dioxide (SiO2) with Hematite inclusions
Sedimentary / Metamorphic
Banded Iron Formation
Banded Iron Formation (BIF)
Metamorphic Rock
Moss Agate / Carnelian Agate
Silicon Dioxide (SiO2) with iron and manganese inclusions
mineral
Leopardskin Jasper
Jasper (a variety of microcrystalline Quartz)
Sedimentary
Ferruginous Quartz on Ironstone
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
metamorphic
Banded Chert / Flint
Silicon dioxide (SiO2)
sedimentary