Sedimentary (Base), Then Artificial

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Heat-Treated Citrine (Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2) with artificial pigment

Peacock Ore (Bournite/Chalcopyrite)

Bornite (Cu5FeS4) or Acid-Treated Chalcopyrite (CuFeS2)

Chakra Stone (Composite / Man-made Bonded Gemstones)

Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)

Likely weathered limestone or calcareous concretion

Calcite-rich carbonate rock; chiefly calcium carbonate (CaCO₃)

Iridescent chalcopyrite (“peacock ore”)

Chalcopyrite, CuFeS₂, commonly surface-oxidized to covellite and related copper sulfides

Orange Calcite point

Calcite (Calcium Carbonate, CaCO3)

Dalmatian Stone

Peralkaline igneous rock containing quartz, feldspar, and arfvedsonite

Dyed blue howlite or magnesite (tumbled stone)

Howlite: Ca₂B₅SiO₉(OH)₅; commonly sold dyed blue to imitate turquoise

Citrine quartz crystal

Quartz, silicon dioxide (SiO₂); yellow variety commonly called citrine

Vesicular basalt

Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine

Mystic Topaz

Al2SiO4(F,OH)2 (Coated)

Dyed Agate

Chalcedony (SiO2)

Heat-Treated Amethyst (Commercial Citrine)

Silicon Dioxide (SiO2) with iron impurities

Heated Citrine (Heat-Treated Amethyst)

Silicon Dioxide (SiO2), quartz variety

Vesicular basalt (likely iron-rich scoria)

Basaltic volcanic rock; chiefly plagioclase, clinopyroxene, olivine, and Fe-Ti oxides

Blue-dyed Quartz Druzy

Silicon Dioxide (SiO2) with artificial pigment

Graphite

Graphite (Carbon, C)

Crackle Quartz (Dyed)

SiO2 (Silicon Dioxide) - Treated

Red Dyed Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Tumbled chert or flint pebble

Microcrystalline quartz (SiO₂), likely chert/flint

Dyed Blue Agate

Silicon Dioxide (SiO2)

Banded Agate (Dyed / Polished)

Microcrystalline Quartz (SiO2)

Likely tumbled sandstone or limestone

Quartz-rich sandstone (possibly calcarenite/limestone)

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

Yellow Chalcedony (Tumbled/Cabochon)

Silicon dioxide (SiO2)

Rainbow Hematite / Magnetic Hematite

Iron oxide (Fe2O3) - often synthetic/coated for beads

Heat-Treated Citrine (Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Dyed Howlite (Dyed Red)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Likely weathered quartz-rich rock fragment

Uncertain; possibly quartz sandstone or a pale feldspathic rock

Weathered sandstone

Quartz-rich clastic sandstone, chiefly SiO₂ with minor feldspar, lithic grains, and iron-oxide/clay cement

Likely basalt fragment

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine

Heat-Treated Citrine (Amethyst Cathedral with Agate inclusions)

Silicon Dioxide (SiO2) with iron impurities

Asphalt (Bituminous Rock)

Natural bitumen or Bituminous limestone/sandstone

Asphalt concrete

Anthropogenic conglomerate

Conglomerate (possibly breccia)

Polymictic clastic conglomerate; rounded clasts in a dark, likely volcanic-lithic matrix

Weathered limestone or calcareous sandstone

Calcite-rich carbonate rock, predominantly CaCO₃; possibly fossiliferous limestone

Gray sandstone or weathered volcanic rock

Likely quartz-rich sandstone; exact identification is uncertain from the image alone

Green Banded Agate

Cryptocrystalline microcrystalline Quartz (SiO2)

Tumbled brown jasper or chert pebble

Microcrystalline quartz (SiO₂), likely jasper/chert

Likely native metallic mineral specimen

Uncertain from photograph; possibly pyrite (FeS₂) or a sulfide-rich metallic ore