Diamond
Carbon (C)
gemstone
Category
Man Made Material (Jewelry, Metal Alloy)
Browse man made material (jewelry, metal alloy) specimens identified by the Rock Identifier community.
Learn about Man Made Material (Jewelry, Metal Alloy) in the encyclopedia
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Tumbled green aventurine
Quartzite dominated by quartz (SiO₂), with green mica/fuchsite inclusions
mineral
Greenstone / Serpentinite Pebble
Serpentinite (Hydrated Magnesium Silicate, Mg3Si2O5(OH)4)
metamorphic
Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Greenstone, likely serpentine or green jasper
Serpentine-group minerals, chiefly antigorite/lizardite; possibly quartz-rich jasper
metamorphic
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)
gemstone
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Jasper (Multi-color Chert)
Silicon Dioxide (SiO2) with impurities
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossil Coral
Rugosa or Tabulata coral fossil (Calcium Carbonate, CaCO3)
fossil
Corundum (Sapphire / Raw Sapphire)
Aluminum Oxide (Al2O3)
gemstone
Thunder Egg (Agate Core)
Cryptocrystalline Quartz (SiO2) in Rhyolite/Perlite Matrix
mineral
Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2)
igneous
Amazonite
K(AlSi3O8)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst Geode (Thunderegg)
Silicon Dioxide (SiO2) - Quartz Variety: Amethyst
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Coral
Rugose coral / Tabulate coral fossil in limestone matrix
fossil
Quartz (Milky Quartz / Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Milky Quartz with Mica inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
mineral
Nuummite
Orthoamphibole (Anthophyllite-Gedrite composition)
metamorphic
Stromatolite (Jasper-replaced)
Fossilized Stromatolite (Cyanobacteria / Cryptozon / Silica SiO2)
sedimentary
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Fire Opal (in matrix)
Hydrated Silica (SiO2·nH2O)
Mineraloid
Petrified Rugose Coral (Horn Coral)
Order Rugosa (extinct coral)
sedimentary
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Weathered gray metamorphic rock, likely phyllite or slate
Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite
metamorphic
Diamond
Carbon (C)
gemstone
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Milky Quartz Chip
Silicon Dioxide (SiO2)
mineral