Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Man Made Material (Jewelry, Metal Alloy)
Browse man made material (jewelry, metal alloy) specimens identified by the Rock Identifier community.
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Amethyst
Silicon Dioxide (SiO2)
mineral
Red Garnet
Pyrope-Almandine series (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
mineral
Rose Quartz Carving
Quartum roseum (Variety of Quartz, SiO2)
Mineral
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Native Gold Nugget
Native Gold (Au)
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Obsidian
Obsidian (volcanic glass)
Igneous
Sea Shell (Fighting Conch Fragment)
Calcium Carbonate (CaCO3) - Strombus alatus fragment
sedimentary (biogenic)
Pyrite
Iron Sulfide (FeS2)
mineral
Amethyst (or Light Amethyst / Rose Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2 + Fe2O3)
mineral
Blue Chalcedony
Chalcedony (Silicon Dioxide, SiO2)
mineral
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Chert / Flint
Chert (varieties include Flint)
Sedimentary
Crinoid Stem Segment Fossil
Crinoidea (columnal ossicle)
fossil
Yooperlite (Syenite clast containing fluorescent Sodalite)
Sodalite-bearing Syenite
igneous
Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Slag Glass (Cullet)
Amorphous Silica / Glass residue
Man-made byproduct (Non-geological)
Pyrite (Pseudomorph)
Iron Sulfide (FeS2)
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary (fossilized)
Strawberry Quartz (or Pink Aventurine)
Quartz with Hematite/Goethite inclusions (SiO2)
mineral
Rhinestone
Artificial Glass/Crystal
gemstone
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Lapis Lazuli
Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
Metamorphic rock
Graphite
Graphite (Carbon, C)
Mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Lapis Lazuli
Lapis Lazuli (Complex rock consisting primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2)
metamorphic
Red Chert (Jasper)
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Dolomite
Dolomite (CaMg(CO3)2)
Mineral
Synthetic Costume Accessory (Non-Geological)
Polyester and Acrylic Fiber (Anthropogenic polymer)
Synthetic / Man-made textile
Blue Slag Glass
Ferro-silicate glass (Slag)
igneous (man-made/industrial)
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Dalmatian Stone (commonly called Dalmatian Jasper)
Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)
igneous
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Fossilized Coral (Petoskey-style)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Malachite
Malachite (Copper Carbonate Hydroxide) - Cu2CO3(OH)2
Mineral
Pyrite
Iron Sulfide (FeS2)
mineral