Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Category
Organic Gem Material (Botanical)
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Jasper
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Shark Tooth Fossil
Vertebrate fossilized tooth (Chondrichthyes)
fossil
Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
Chert (Common Opal or Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Brown Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Common Opal/Agatized Rock)
Microcrystalline Quartz (SiO2) with potential Chalcedony/Opaline silica
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Fossil Shark Tooth
Selachimorpha (Chondrichthyes dental fossil)
sedimentary
Quartz-rich vein rock, likely milky quartz in weathered host rock
Milky quartz (SiO₂), probably with weathered feldspar and iron-oxide staining
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Milky quartz with iron-oxide staining
Quartz, silicon dioxide (SiO₂), likely massive or coarsely crystalline; brown areas are limonite/goethite staining
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified wood
Silicified wood, chiefly microcrystalline quartz (SiO₂)
fossil
Travertine
Travertine (a terrestrial form of Limestone, CaCO3)
sedimentary
Colorless faceted gemstone (likely cubic zirconia)
Cubic zirconia, ZrO₂ (synthetic zirconium dioxide); possibly synthetic glass or lab-grown diamond
gemstone
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Iron-rich quartzite or ferruginous metamorphic rock
Ferruginous quartzite, likely hematite/goethite-bearing quartzite; SiO₂ with Fe₂O₃/FeO(OH)
metamorphic
Chalcedony (Chert/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Rhodonite
Rhodonite (MnSiO3)
mineral
Greenstone / altered mafic rock
Likely chlorite–actinolite metabasalt (greenschist); exact identification requires testing
metamorphic
Quartzite
Quartzite, predominantly crystalline SiO₂
metamorphic
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Raw green beryl (likely aquamarine)
Beryl, Be₃Al₂Si₆O₁₈; blue-green variety is aquamarine
gemstone
Vesicular basalt (possibly scoria)
Basalt; chiefly plagioclase feldspar, pyroxene, and often olivine, with volcanic glass
igneous
Fossilized Bone
Permineralized Bone (Vertebrate Fossil)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Shark Tooth Fossil
Carcharocles megalodon or similar fossilized shark tooth
fossil
Sandstone
Arenite
sedimentary
Chert (Nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Yellow Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Chalcedony/Agate Pebble)
Cryptocrystalline Silica (SiO2)
sedimentary