Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Category
Man Made Glass
Browse man made glass specimens identified by the Rock Identifier community.
Learn about Man Made Glass in the encyclopedia
View all →
Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Man-made Material (jewelry, metal alloy)
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Lapis Lazuli
Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)
Mineral, part of a rock
Quartz
Silicon Dioxide (SiO₂)
Mineral
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Smoky Quartz
Smoky Quartz (SiO2)
Mineral
Chert (or possibly Flint)
Chert (variant: Flint)
Sedimentary
Glazed Ceramic Tile
Fused Silicate-Clay composite
Synthetic (Man-made material mimicking natural stone)
Metallic Ornament / Jewelry
N/A - This is an artificial object, not a geological specimen.
This appears to be a man-made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen.
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Sea Glass
Silica (SiO2) - Amorphous
Mineral
Basalt
Basalt
igneous
Diabase (Dolerite)
Diabase / Dolerite
igneous
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Land Snail Shell
Gastropoda (Calcium Carbonate, CaCO3)
fossil
Muscovite Schist
KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix
metamorphic
Sandstone
Arenite
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Quartz (Druzy / Goldstone Gemstone Cabochon)
Silicon Dioxide (SiO2)
gemstone
Diabase (Greenstone)
Diabase (Dolerite)
igneous
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
sedimentary
Bog Iron / Limonite Concretion
Goethite/Limonite mixture (FeO(OH)·nH2O)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite staining)
sedimentary
Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Scoria
Scoriaceous Basalt
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz (likely carved)
Rose Quartz (SiO2)
Mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (felsic intrusive igneous rock)
igneous
Dyed Blue Agate Slice
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Celestite
Celestine (SrSO4)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.
SiO2 (Silicon Dioxide)
Mineral or Sedimentary (if chert)
Quartz with Iron Oxide
SiO2
mineral
Banded Calcite or Travertine
Calcium Carbonate (CaCO3)
Sedimentary
Blue Celestite
Strontium Sulfate (SrSO4)
mineral
Quartz with impurities or Host Rock
SiO2 (Silicon Dioxide) with mixed silicates
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic