Rough Diamond
Diamond (pure Carbon, C)
mineral
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Peridot in Basalt
Olivine ((Mg, Fe)2SiO4) in Basalt
mineral
Staurolite
Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)
mineral
Opalite
Synthetic Glass (Simulated Moonstone/Opal)
gemstone
Fossil coral fragment
Likely calcitic colonial coral, possibly fossilized scleractinian coral
fossil
Quartz and Iron Oxide
Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions
mineral
Granitic Pegmatite
Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)
igneous
Black Tourmaline (Schorl)
Sodium Iron Aluminum Borate Silicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral/gemstone
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Quartz-lined vesicle in basalt (amygdaloidal basalt)
Amygdaloidal basalt with drusy quartz; predominantly plagioclase, pyroxene, and iron oxides
igneous
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Yellow Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Gold in Quartz
Hydrothermal Quartz with Native Gold (SiO2 with Au)
mineral
Cubic Zirconia (Faceted)
Zirconium dioxide (ZrO2)
mineral
Pegmatite
Granitic Pegmatite
igneous
Pyrite
Pyrite (FeS2)
Mineral
Diamond
Carbon (C)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Serpentine
Serpentine subgroup (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
White Sapphire
Corundum (Al2O3)
mineral
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Rounded brown pebble, likely weathered sandstone or iron-stained quartzite
Probable quartz-rich sandstone (SiO₂-dominated); exact identification requires testing
sedimentary
Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Anthropogenic (Man-made)
Celestine
SrSO4
mineral
Possible flint or slag fragment
Microcrystalline quartz (chalcedony), or iron-rich industrial slag
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist
metamorphic
Aluminum Slag
Anthropogenic Aluminum (Al)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartzite pebble
Quartzite (SiO2)
metamorphic
Peridotite (Dunite)
Olivine-rich Peridotite ((Mg,Fe)2SiO4)
igneous
Corundum (Sapphire variant)
Aluminum Oxide (Al2O3)
mineral
Pink Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Quartzite Pitting Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Druzy Quartz (on Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Coal (Anthracite or Bituminous)
Lithified plant matter (Carbon)
sedimentary
Limestone
Sedimentary rock composed primarily of Calcite (CaCO3)
sedimentary
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
industrial byproduct