Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Category
Man Made Object (Simulant)
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Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Nodular or Massive Variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Angel Aura Quartz (Treated Clear Quartz)
Silicon Dioxide (SiO2) coated with Vaporized Silver and Platinum
mineral
Chert (variations include Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Grey-Green Flint)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Carved quartz (likely rose quartz and green aventurine/quartz)
Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine
gemstone
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Tektite
Impactite (Natural Silicate Glass)
meteorite
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Pink Marble
Recrystallized Limestone (Calcium Carbonate, CaCO3)
metamorphic
Chert (Flint)
Chert (Microcrystalline or cryptocrystalline Quartz - SiO2)
sedimentary
Fossil Shark Tooth
Carcharocles or Lamniformes (order)
fossil
Chert (Field-collected Arrowhead-shaped Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Native Silver
Silver (Ag)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (specifically Gray/Blue-Gray Chert)
Chert (SiO2)
sedimentary
Chert (specifically Zebra Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule/Pebble)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Blue-dyed Quartz Druzy
Silicon Dioxide (SiO2) with artificial pigment
mineral
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of crocidolite
Mineral
Polished black-and-white banded stone, likely tourmalinated quartz or zebra jasper
Quartz (SiO₂) with black tourmaline (schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄), or quartz-rich zebra jasper
mineral
Tumbled carnelian
Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)
gemstone
Fluorite
Calcium fluoride (CaF2)
mineral
Tumbled black-and-gold tiger’s-eye
Quartz pseudomorph after crocidolite; SiO₂ with iron oxides
metamorphic
Tumbled howlite (likely)
Howlite, Ca₂B₅SiO₉(OH)₅
mineral
Polished labradorite cabochon
Labradorite, a calcic plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
mineral
Tumbled red jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions
mineral
Likely tumbled jasper or chert specimens
Microcrystalline quartz (SiO₂), commonly jasper/chert; exact identification is uncertain from the photograph
sedimentary
Dalmatian jasper
Orbicular rhyolite, commonly sold as Dalmatian jasper; mainly quartz, feldspar, and altered mafic minerals
igneous
Rounded chert or chalcedony pebble
Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony
sedimentary
Botryoidal chalcedony (gray agate/jasper-like silica)
Microcrystalline quartz, SiO₂; likely chalcedony with opaque quartz or jasper inclusions
mineral
Polished jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay-mineral impurities
metamorphic
Polished brecciated jasper (likely orbicular/picture jasper)
Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide staining and breccia fragments
mineral
Hematite
Hematite (Fe2O3)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral