Quartz Crystal Cluster / Quartzite
Silicon Dioxide (SiO2)
mineral
Category
Organic Mineraloid And Mineral
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Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2)
mineral
Aura Quartz (Titanium/Rainbow Quartz)
SiO2 (Silicon Dioxide) with metallic coating
mineral
Amethyst Geode
Amethyst/Purple Quartz (SiO2)
mineral
Fossilized tooth, likely a mammalian tooth fragment
Indeterminate fossil tooth; possibly an ungulate or carnivoran tooth
fossil
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Mammoth Tooth
Mammuthus tooth
fossil
Fossil Shark Tooth
Selachii fossil
fossil
Fairy Stone (Menilite Concretion)
Carbonate-rich concretion (often Siderite or Calcite in Clay)
sedimentary
Glauconitic Sandstone
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Chert
Silicon dioxide (SiO2)
Sedimentary
Amber
Succinite (Fossilized Tree Resin)
gemstone
Amber
Succinite (C10H16O)
gemstone
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized coral (likely honeycomb or branching coral)
Fossil coral; probable Scleractinia or Tabulata, composition mainly microcrystalline CaCO₃
fossil
Amber and Tumbled Stones
Fossilized Tree Resin (Succinite)
fossil
Amber
Succinite (Resinite)
fossil
Green Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
sedimentary
Red Moss Agate (Jasper)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Fossil Shark Tooth
Carcharodon or Carcharias fossil (Vertebrate Fossil)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Bone
Petrified Bone (Fluorapatite / Calcium Phosphate replacement)
fossil
Glauconitic Sandstone
Glauconitic Quartz Arenite (with K,Mg,Fe,Al silicate hydroxide)
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Limonite streaks)
sedimentary
Fossilized Wood / Petrified Wood
Petrified Wood (Silicified Flora)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Bivalve Shell
Class Bivalvia (fossilized)
fossil
Enrolled Trilobite Fossil
Phylum Arthropoda, Class Trilobita (likely Calymene or Flexicalymene)
fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
mineral
Banded Calcite (Zebra Calcite)
Calcite (CaCO3) with trace organic or oxide inclusions
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chalcedony (Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Fossiliferous Sandstone / Mudstone
Sedimentary Rock (Clastic with Fossiliferous Inclusions)
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary