White-and-dark marble or agate-style gemstone bead bracelet
Likely calcite-rich marble (CaCO₃) mixed with dark gray stone beads; exact material is uncertain from the photo
metamorphic
Category
Mineral (Man Made Composite)
Browse mineral (man made composite) specimens identified by the Rock Identifier community.
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Granite
Granite (phaneritic felsic intrusive rock)
igneous
Strawberry Quartz (or Pink Aventurine)
Quartz with Hematite/Goethite inclusions (SiO2)
mineral
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Dragon Vein Agate (Dyed/Treated)
Agate (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe4+ impurities)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Dyed Blue Agate Slice
Silicon Dioxide (SiO2)
mineral
Chert (Yellow Jasper/Flint)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide)
igneous
Fossilized Ray Barb (Stinger) Fragment
Myliobatiformes indet. (Fossil stingray spine)
fossil
Lapis lazuli and green-blue chalcedony jewelry
Lapis lazuli: lazurite-bearing metamorphic rock, chiefly lazurite (Na₃Ca(Al₃Si₃O₁₂)S) with calcite and pyrite; second stone: likely chrysoprase or green-blue chalcedony (microcrystalline quartz, SiO₂)
gemstone
Tumbled purple quartz, likely amethyst or lavender quartz
Quartz (SiO₂), probably iron-colored amethyst; exact variety uncertain from the image
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Basalt
Basalt (extrusive igneous rock)
Igneous
Amethyst Cluster
Silicon Dioxide with Iron impurities (SiO2)
mineral
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Moonstone
Orthoclase Feldspar (formula: (K,Na)AlSi3O8)
mineral
Diamond
Natural Diamond (Carbon, C)
gemstone
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Gold
Native Gold (Au)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Tumbled iron-rich stone, likely hematite-bearing jasper
Jasper (microcrystalline quartz, SiO₂) with iron oxides, chiefly hematite/goethite
mineral
Sea Shell (Fighting Conch Fragment)
Calcium Carbonate (CaCO3) - Strombus alatus fragment
sedimentary (biogenic)
Tumbled orange chalcedony / jasper
Microcrystalline quartz, SiO₂, likely iron-stained chalcedony or quartz-rich jasper
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Pearl (Biogenic)
Nacre / Calcium Carbonate (CaCO3)
mineral
Sunstone
Aventurine Feldspar (Plagioclase Feldspar with inclusions)
mineral
Diamond
Carbon (C)
mineral
Granite
Felsic intrusive igneous rock
igneous
Diamond
Carbon (C)
gemstone
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone (Pebble)
Sandstone (arenite, arkose, wacke depending on composition)
sedimentary
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)
mineral