Polished fossil-bearing amber cabochon (likely insect inclusion)
Fossilized plant resin; commonly Dominican or Baltic amber, chemically a complex diterpenoid resin
fossil
Category
Man Made Material (Jewelry, Metal Alloy)
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Obsidian
Volcanic Glass (SiO2)
igneous
Quartzite
Quartzite (mostly SiO2)
metamorphic
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Diamond (in jewelry)
Cubic Carbon (C)
mineral
Gold Ore in Quartz
Auriferous Quartz (Au + SiO2)
igneous
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Pyrite (Cube variety)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Smoky Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
Gold Flake
Native Gold (Au)
mineral
Pallasite Meteorite
Pallasite (Iron-Nickel Matrix with Olivine/Peridot inclusions)
Mineral / Extraterrestrial Rock
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)
![Native Copper with Malachite and Chrysocolla (Native Copper (Cu) with Malachite [Cu2CO3(OH)2] and Chrysocolla [(Cu,Al)2H2Si2O5(OH)4·nH2O]) — mineral](https://media.rockidentification.com/6ef339a6-a6eb-4aa3-8f16-7b2b668937bc-thumbnail.jpg)
Native Copper with Malachite and Chrysocolla
Native Copper (Cu) with Malachite [Cu2CO3(OH)2] and Chrysocolla [(Cu,Al)2H2Si2O5(OH)4·nH2O]
mineral
Obsidian
Volcanic glass
igneous
Obsidian
Volcanic glass (SiO2)
igneous
Sunstone
(Ca,Na)((Al,Si)2Si2O8) - Plagioclase Feldspar
mineral
Fossil Coral
Scleractinia (Stony Coral) fossil
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Gold Ore in Quartz
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Marble
Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)
metamorphic
Tiger’s-eye bead bracelet
Chatoyant quartz, principally quartz (SiO₂) with pseudomorphic fibrous crocidolite/goethite inclusions
gemstone
Diamond
Diamond (pure Carbon, C)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Iron Meteorite (likely Chondrite or Iron-Nickel fragment)
Siderite (Iron Meteorite), primarily Fe-Ni (Iron-Nickel) alloy
igneous
Chalcedony (Common Opal or Agate variant)
Silicon dioxide (SiO2) with trace hydration
mineral
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Green Slag Glass
Amorphous Silica Glass (Anthropogenic)
Industrial byproduct (often mistaken for obsidian or mineral)
Pyrite
Iron Sulfide (FeS2)
mineral
Aqua Aura Quartz
Titanium/Gold-coated Silicon Dioxide (SiO2)
mineral
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Slag Glass
Amorphous Silica Glass (with metal oxide inclusions)
Mineraloid / Industrial Waste
Obsidian
Obsidian (volcanic glass, amorphous silica rich rock)
Igneous
Fluorite (often called Rainbow Fluorite or Purple-Green Fluorite)
Calcium Fluoride (CaF2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
mineral