Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
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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Pyrite
Iron Disulfide (FeS2)
mineral
Red jasper pebble
Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides
metamorphic
Quartz (Iris / Rainbow Quartz)
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Fossilized tooth or tooth fragment
Indeterminate vertebrate tooth; likely mammalian, mineralized hydroxyapatite
fossil
Diorite
Diorite (Plagioclase feldspar and amphibole/biotite)
igneous
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Copper Composite Turquoise (Purple and Blue)
Composite Hydrous copper aluminum phosphate with bronze/copper matrix binding
gemstone
Granite
Granite (phaneritic felsic intrusive rock)
igneous
Black Obsidian
Obsidian, volcanic glass (Amorphous SiO₂)
Igneous Rock
Sandstone
Sandstone (SiO2 dominated)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amber (Simulated/Faturan Style)
Resin mix (Likely Phenolic/Celluloid if synthetic, Succinite if natural)
Organic Gemstone (not a mineral)
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Diamond (in jewelry)
Diamond (Carbon, C)
mineral
Pearl (Biogenic Mineraloid)
Calcium carbonate (Aragonite) and Conchiolin, CaCO3
mineral
Faceted Diamond / Moissanite / Cubic Zirconia
Carbon (C) if Diamond, Silicon Carbide (SiC) if Moissanite
gemstone
Red cabochon gemstone, likely carnelian or dyed chalcedony
Chalcedony (microcrystalline quartz), SiO₂; exact identification requires testing
gemstone
Citrine Geode
Citrine (Silicon Dioxide, SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sapphire
Corundum (Al2O3)
gemstone
Granite
Intrusive Felsic Igneous Rock
igneous
Tumbled brown pebble
Indeterminate; likely quartz-rich sandstone or chert
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron and silicate inclusions
sedimentary
Cubic Zirconia (as used in jewelry setting)
Zirconium dioxide (ZrO2)
mineral
Yellow Howlite (Dyed Magnesite/Howlite)
Dyed Ca2B5SiO9(OH)5 (Howlite) or MgCO3 (Magnesite)
mineral
Rhodochrosite (Beads) and Citrine (Pendant)
Rhodochrosite (MnCO3) and Quartz variety Citrine (SiO2)
mineral
Sandstone (Pebble)
Arenite
sedimentary
Citrine
Quartz (SiO₂)
mineral
Emerald crystal in host rock
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Diamond (set in a gold ring)
Carbon (C) - Adamantine cubic carbon
mineral
Sandstone Pebble
Arenite (SiO2 primarily)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia - ZrO2, Moissanite - SiC)
gemstone
Polished brecciated jasper pebble
Microcrystalline quartz (SiO₂), with iron-oxide inclusions
mineral
Sapphire
Corundum (Al2O3)
mineral
Sapphire (Rough Corundum)
Corundum (Aluminum Oxide, Al2O3)
mineral