Tumbled amethyst
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Category
Man Made Object (Simulant)
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Brecciated jasper (likely ocean jasper or rhyolitic jasper)
Silica-rich volcanic breccia composed mainly of microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and possible feldspar
igneous
Tumbled jasper (likely brecciated or orbicular jasper)
Microcrystalline quartz (SiO₂), with iron-oxide inclusions
mineral
Polished blue labradorite
Labradorite, calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)
mineral
Blue-green turquoise-like tumbled stone
Turquoise, hydrous copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Tumbled dark red-brown stone, possibly jasper
Likely opaque microcrystalline quartz (chalcedony/jasper), SiO₂; exact identification is uncertain from the blurred photograph
gemstone
Flint
SiO2 (Cryptocrystalline Quartz / Chert)
sedimentary
Agate
Silicon Dioxide (Quartz), SiO2
mineral
Argillite
Argillite (Fine-grained sedimentary rock composed mostly of clay-sized particles)
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Amber
Fossilized tree resin (Amorphous organic polymer)
gemstone
Fluorite
Calcium Fluoride (CaF2)
mineral
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Tumbled ocean jasper or orbicular jasper
Microcrystalline quartz (SiO₂), commonly with chalcedony, feldspar, and iron-oxide inclusions
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Amethyst
Silicon Dioxide (SiO2) with iron impurities
gemstone
Satin Spar Gypsum (Selenite Wand)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Amber
Amber (Fossilized Tree Resin)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Pink Dyed Agate (Pink Agate Slice)
Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz
mineral
Ruby Fuchsite / Ruby in Fuchsite
Ruby (Al2O3 variety corundum) and Fuchsite (K(Al,Cr)2AlSi3O10(OH)2 - a chromium-rich variety of muscovite mica) in Quartz matrix
Mineral
Red Jasper (Skull Carving)
Jasper (Silicon Dioxide, SiO2 plus Iron Oxide inclusions)
sedimentary
Agate
Agate (Silicon Dioxide, SiO2)
mineral
Mahogany Obsidian
Volcanic glass containing Magnetite/Hematite
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Amber
Succinates (Organic Fossilized Resin)
mineraloid
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Desert Rose (Barite Rose / Gypsum Rose)
Barium Sulfate (BaSO4) or Hydrous Calcium Sulfate (CaSO4%22H2O)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Slate
Metamorphic pelitic rock
metamorphic
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
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