Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Category
Mineraloid (Man Made Glass)
Browse mineraloid (man made glass) specimens identified by the Rock Identifier community.
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Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
Sedimentary
Moonstone
Orthoclase Feldspar (formula: (K,Na)AlSi3O8)
mineral
Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Pearl (Biogenic)
Nacre / Calcium Carbonate (CaCO3)
mineral
Sunstone
Aventurine Feldspar (Plagioclase Feldspar with inclusions)
mineral
Diamond
Carbon (C)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Jasper Variant likely)
Silicon Dioxide (SiO2)
Sedimentary Rock or Mineral (depending on origin and purity)
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite
Phaneritic plutonic rock (SiO2 typically >69%)
igneous
Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2
mineral
Tree Agate
Chalcedony (SiO2)
gemstone
Chert / Yellow Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chert with Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Coquina
Biogenic Limestone (Calcite/Aragonite base, CaCO3)
sedimentary
Chert (specifically White Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amber (Copal)
Organic gemstone, fossilized tree resin (often immature amber or copal)
Mineral
Hoodoo (Limestone / Siltstone Formation)
Claron Formation (Sedimentary Rock - Limestone, Mudstone, Dolomite)
sedimentary
Megalodon Shark Tooth
Otodus megalodon
fossil
Chert / River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
sedimentary
Diamond (Cut Gemstone)
Natural Carbon (C)
gemstone
Diamond (Faceted)
Carbon (C)
gemstone
Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint or Common Chert node)
Silicon Dioxide (SiO2)
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Granite
Phaneritic Plutonic Felsic Rock
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Turquoise bead bracelet
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Desert Rose (Barite Rose / Gypsum Rose)
Barium Sulfate (BaSO4) or Hydrous Calcium Sulfate (CaSO4%22H2O)
mineral
Slate
Metamorphic pelitic rock
metamorphic
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Angel Aura Quartz (Treated Clear Quartz)
Silicon Dioxide (SiO2) coated with Vaporized Silver and Platinum
mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral