Rounded gray stone, likely slate or fine-grained sandstone
Probable slate (low-grade metamorphosed shale) or lithic sandstone; exact identification requires testing
sedimentary
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
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Native Silver Nugget
Silver (Ag)
mineral
Tangerine Quartz
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Amethyst Elestial Quartz
Silicon Dioxide with inclusions (SiO2)
mineral
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Granite
Phaneritic Plutonic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Titanium Quartz (Aura Quartz)
Silicon Dioxide (SiO2) treated with Titanium
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Granite and Mixed Landscape Gravel
Plutonic Igneous Rock / Weathered Alluvium
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Black Shale
Argillaceous Chert/Shale
sedimentary
Banded Chert (Jasper) River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Blue Sapphire
Corundum (Al2O3)
gemstone
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Pitted Sedimentary Rock / Cupstone
Sedimentary rock with weathering pit (arenite / sandstone)
sedimentary
Sandstone Cobble with Iron Staining
Arenite with Limonite/Goethite coatings
sedimentary
Sandstone (Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Diamond (Set in Jewelry)
Carbon (C)
gemstone
Tourmalinated quartz sphere
Quartz (SiO₂) with black schorl tourmaline inclusions
mineral
Dyed Agate Geode (Pink/Magenta)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Blue Sapphire Crystal (Rough)
Corundum (Aluminum Oxide, Al2O3)
mineral
Chalcopyrite
CuFeS2 (Copper Iron Sulfide)
mineral
Granite
Intrusive Igneous Rock
igneous
Sandstone (specifically Arkose or Ferruginous Sandstone)
Sandstone (SiO2 predominant)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O
igneous
Chalcopyrite
CuFeS2
mineral
Citrine
Silicon Dioxide (SiO2)
gemstone
Peacock Ore
Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)
mineral
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Aventurine (likely Green Aventurine)
Aventurine (a variety of quartz, SiO₂, with common inclusions of fuchsite)
Mineral/Metamorphic Rock
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Greenschist
Greenschist (chlorite schist)
metamorphic
Dyed Agate / Quartz (Tumbled)
Silicon Dioxide (SiO2) with artificial dye
mineral
Pearl-embellished decorative cross
Pearl (biogenic calcium carbonate, predominantly aragonite) with rhinestone-mounted glass or synthetic gemstones
gemstone
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Granite
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8), and Mica)
igneous
Tiger Iron
Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)
metamorphic
Faceted Clear Gemstone (Likely Quartz or Cubic Zirconia)
Silicon Dioxide (SiO2) or Zirconium Dioxide (ZrO2)
gemstone