Sandstone
Arenite (Clastic Sedimentary Rock)
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
Smooth river pebble
Indeterminate lithology; likely fine-grained quartz-rich sandstone, siltstone, or weathered chert
sedimentary
Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')
Silicon Dioxide (SiO2) with artificial pigment
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Pumice
Pumice (Vitreous volcanic rock)
igneous
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Green sea glass or green glass-like tumbled material
Amorphous silicate glass; likely anthropogenic soda-lime glass, not a natural mineral
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Beaded gemstone jewelry, likely carnelian and green aventurine
Carnelian: orange chalcedony (microcrystalline SiO₂); green aventurine: quartz with fuchsite or other inclusions (SiO₂)
gemstone
Sandstone
Sedimentary rock composed mainly of sand-sized minerals or rock grains
sedimentary
Sandstone
Arenite (Silicon Dioxide, SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Polished brown chalcedony (likely carnelian or jasper)
Microcrystalline quartz, SiO₂; iron oxides produce the brown coloration
mineral
Unidentified pale mineral or rock surface
Indeterminate from image; possibly a small quartz or feldspar grain
mineral
White cabochon gemstone, likely milky chalcedony or opalite
Chalcedony: microcrystalline quartz, SiO₂; appearance may also indicate synthetic opalite glass
gemstone
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Fossil Turtle Shell
Testudines carapace fossil
fossil
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Chert
Chert (Microcrystalline Quartz)
sedimentary
Basalt
Basalt
Igneous
Sandstone
Arenite (SiO2 principal)
sedimentary
Diamond
Cubic carbon (C)
mineral
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
igneous
Mixed gemstone bead bracelet
Likely rose quartz, amethyst, and possibly rhodonite or lepidolite beads
gemstone
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Carved jasper bear figurine
Jasper, microcrystalline quartz (SiO₂), likely brecciated or orbicular jasper
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Tumbled milky quartz pebble
Quartz (SiO₂), likely milky quartz
mineral
Flint
Silicon dioxide (SiO2)
sedimentary
Small metallic-gold mineral fragment, possibly pyrite
Pyrite (FeS₂), if confirmed
mineral
Chert (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
Graphite
Graphite (Carbon, C)
mineral
Diamond
Carbon (C)
gemstone