Slag (Industrial Glass/Metal)
Ferrous slag or Glassy silicate byproduct
Antropogenic rock (Man-made)
Category
Sedimentary (Man Made Conglomerate)
Browse sedimentary (man made conglomerate) specimens identified by the Rock Identifier community.
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Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Granite
Intrusive Igneous Rock (Granitic)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite (Phaneritic Quartz-Feldspar intrusive rock)
Igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Fossilized Coral (Petoskey Stone / Hexagonaria)
Hexagonaria percarinata / Rugosa coral (CaCO3)
fossil
Slate
Metamorphic Pelitic Rock
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2+KAl2(AlSi3O10)(OH)2)
metamorphic
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Gabbro
Gabbro (Mg, Fe)2Si2O6 / (Ca, Na)(Al, Si)4O8
igneous
Diamond (in Jewelry)
Carbon (C)
mineral
Blue-green chrysocolla rough specimen
Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite
mineral
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Quartzite
Metamorphic Quartzite
metamorphic
Green Quartzite
Metamorphic Quartz Sandstone (SiO2)
metamorphic
Red Quartzite
Quartzite (Metamorphosed Quartz Arenite)
metamorphic
Diamond
Carbon (C)
gemstone
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Natural Pearl
Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3
mineral
Tumbled blue-green stone, likely chrysocolla or dyed chalcedony
Probable chrysocolla (hydrated copper aluminosilicate; variable composition), though appearance could also represent dyed chalcedony
mineral
Petoskey Stone / Rugose Coral Fossil
Hexagonaria percarinata
fossil
Likely blue glass or synthetic gemstone jewelry
Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass
gemstone
Chert / Flint
Chert (varieties include Flint)
Sedimentary
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granite
Granite (a plutonic rock)
Igneous
Granite
Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)
Igneous
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
igneous
Granite
Granite (Plutonic Igneous Rock)
igneous
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite (Silicic Intrusive Igneous Rock)
Igneous
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
gemstone
Green Quartzite
Metamorphic Quartzite (often colored by chromium-bearing minerals or fuchsite)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Smoky Quartz
Smoky Quartz (SiO2)
mineral
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral