Sandstone
Arenite (SiO2 principal)
sedimentary
Category
Man Made Glass (Not A Natural Rock Or Mineral)
Browse man made glass (not a natural rock or mineral) specimens identified by the Rock Identifier community.
Learn about Man Made Glass (Not A Natural Rock Or Mineral) in the encyclopedia
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Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Fossil Turtle Shell
Testudines carapace fossil
fossil
Basalt
Basalt
Igneous
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Mixed gemstone bead bracelet
Likely rose quartz, amethyst, and possibly rhodonite or lepidolite beads
gemstone
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Tumbled milky quartz pebble
Quartz (SiO₂), likely milky quartz
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Flint
Silicon dioxide (SiO2)
sedimentary
Tumbled blue stone, likely blue aventurine or dyed chalcedony
Aventurine quartz (SiO₂) or chalcedony (microcrystalline SiO₂); exact identification requires testing
mineral
Likely sandstone pebble
Quartz-rich sandstone (composition uncertain from the image)
sedimentary
Opalite
Synthetic glass (Opalite simulant)
gemstone
Carved jasper bear figurine
Jasper, microcrystalline quartz (SiO₂), likely brecciated or orbicular jasper
mineral
Banded Sandstone (Beach Pebble)
Quartz Arenite Sandstone
sedimentary
Tumbled yellow jasper or chalcedony
Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Gemstone bead necklace (likely citrine or yellow quartz)
Quartz, SiO₂; precise identification is uncertain because the beads are blurred and metal settings obscure them
gemstone
Diamond
Diamond (pure carbon C)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Small metallic-gold mineral fragment, possibly pyrite
Pyrite (FeS₂), if confirmed
mineral
Diamond
Carbon (C)
gemstone
Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
igneous
Diamond
Cubic carbon (C)
mineral
Synthetic Faux Fur Fursuit
Polyacrylonitrile / Polyester (Synthetic Textile)
not a rock (synthetic material/costume)
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Graphite
Graphite (Carbon, C)
mineral
Tektite
Natural impact glass
meteorite
Painted Rock / Geode Specimen
Silicon Dioxide with artificial pigment coating
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenaceous sedimentary rock
sedimentary
Clear gemstone earring (likely cubic zirconia)
Cubic zirconia (synthetic zirconium dioxide, ZrO₂); identification from the image is uncertain
gemstone
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary