Siltstone
Siltstone (primarily composed of microcrystalline Quartz and Feldspar)
Category
Browse industrial byproduct (anthropogenic rock) specimens identified by the Rock Identifier community.
Siltstone
Siltstone (primarily composed of microcrystalline Quartz and Feldspar)
Limestone
Calcium Carbonate (CaCO3)
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Turquoise and Hematite
CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Fe2O3 (Hematite)
Diamond
Cubic Carbon (C)
Herkimer Diamond
Quartz (Silicon Dioxide - SiO2)
Jasper
Agate/Jasper (Microcrystalline Quartz, SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Satin Spar (often marketed as Selenite)
Gypsum (CaSO4·2H2O)
Milky Quartz
Silicon Dioxide (SiO2)
Mixed Quartz Bracelet (Rose Quartz and Larimar-colored beads)
Silicon Dioxide (SiO2) with various inclusions
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
Chert (variations include Flint/Jasper)
Chert (SiO2)
Diamond (specifically Blue Diamond color appearance)
Carbon (C) with trace Boron
Red Jasper
Silicon Dioxide (SiO2) with Ferric Iron inclusions
Quartzite
Quartzite (SiO2)
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Pyrite in Quartz
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
Milky Quartz with Chlorite inclusions
Silicon Dioxide (SiO2) with Chlorite group minerals
Diamond (Cluster Setting)
Carbon (C) - Diamond
Diamond
Diamond (C)
Cubic Zirconia (Simulated Diamond)
Zirconium dioxide (ZrO2)
Aquamarine (Beryl)
Beryllium aluminum silicate (Be3Al2Si6O18)
Milky Quartz with Mica
Silicon Dioxide (SiO2) with Muscovite Mica [KAl2(AlSi3O10)(OH)2]
Anthracite Coal
Anthracite
Epithermal Gold Ore (in Quartz/Rhyolite matrix)
Auriferous Quartz (Au + SiO2)
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
Vanadinite
Vanadinite (Pb5(VO4)3Cl)
Native Copper in Basalt
Cuprum (with Host Basalt)
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
Blue Calcite
Calcium Carbonate (CaCO3)
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
Grey Chalcedony
Silicon Dioxide (SiO2)
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
Granitic Pegmatite with Tourmaline
Granite (Feldspar/Quartz matrix) with Schorl (NaFe2+3Al6Si6O18(BO3)3(OH)3OH)
White Topaz
Topaz - Al2SiO4(F,OH)2
Chert (Jasper variety)
Silicon Dioxide (SiO2)
Yellow Jasper
Chalcedony (SiO2) with iron oxide inclusions