White Agate / Chalcedony
Silicon Dioxide (SiO2)
gemstone
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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Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise (Blue Howlite / Magnesite imitation)
CuAl6(PO4)4(OH)8·4H2O (for natural Turquoise); Ca2B5SiO9(OH)5 (for Howlite)
mineral
Granite
Intrusive Igneous Rock
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Gold
Native Gold (Au)
mineral
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Emerald
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Tumbled greenstone/chlorite-rich pebble
Likely chlorite-rich greenschist or altered basalt; exact identification requires testing
metamorphic
Citrine (Heat-Treated)
Silicon Dioxide (SiO2)
mineral
Gold-bearing Quartz (Auriferous Quartz)
Quartz (SiO2) with native Gold (Au) inclusions
mineral
Smoky Quartz
Quartz (SiO₂)
Mineral
Aragonite (specifically Mexican Marbled Onyx)
Aragonite (Calcium Carbonate, CaCO3)
mineral
Bismuth
Bismuth (Bi)
Mineral
Pink quartz bead strand (likely rose quartz or pink dyed quartz)
Quartz, silicon dioxide (SiO₂); probable rose quartz variety, possibly dyed or treated quartz/chalcedony
mineral
Dyed Agate Geode Slice
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Libyan Desert Glass
Natural Silica Glass (SiO2 with minor iron and titanium)
mineraloid
Chert (specifically Gray/Blue-Gray Chert)
Chert (SiO2)
sedimentary
Chert (Hagstone / Lucky Stone)
Microcrystalline Quartz (SiO2)
sedimentary
White Sapphire
Corundum (Al2O3)
mineral
Green Quartzite (with Hematite inclusions)
Metamorphic Quartz (SiO2) with various inclusions
metamorphic
Yellow Quartzite Pebble
Quartzite (SiO2)
metamorphic
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Orange Quartzite (or Quartz River Pebble)
Silicon Dioxide (SiO2) - Quartzite
metamorphic
Sandstone with Quartz Sphere
Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Green Jasper)
Microcrystalline Quartz (SiO2) with iron silicate inclusions
sedimentary
Chert (with Patina)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Carnelian variety)
Microcrystalline Quartz (SiO2)
sedimentary
Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Black Onyx
Silicon Dioxide (SiO2) - Chalcedony variant
mineral
Turquoise in Matrix
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide - SiO2)
mineral
Diamond
Diamond (C)
Mineral
Chert (Iron-stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Composite Turquoise or Reconstituted Turquoise with Copper inclusions
CuAl6(PO4)4(OH)8·4H2O (Turquoise) mixed with matrix and copper/bronze flakes
mineral
Geode / Fossilized Gastropod or Shell Cast
Silicon dioxide (Quartz) replacement / fossil mold
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chert / Flint Nodules
Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic intrusive felsic igneous rock
igneous
Granite
Granite (interlocking crystals of quartz, feldspar, and mica)
igneous
Rounded flint or chert pebble
Microcrystalline quartz (SiO₂), commonly chalcedony with possible impurities
sedimentary