Green Chalcedony Ring
Silicon Dioxide (SiO2)
gemstone
Category
Man Made Object (Ring)
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Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Portable Ceramic Space Heater
Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements
not a rock (synthetic/industrial object)
Petrified Wood
Silicified wood (Quartz / Chalcedony replacement of organic cellulose)
fossil
Green Jade (specifically Nephrite)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Diamond
Carbon (C)
gemstone
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide impurities
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossiliferous Flint or Chert with Bryozoan Fossils
Sedimentary cryptocrystalline quartz (SiO2) with fossil inclusions
sedimentary
Diamond
Native Carbon (C)
mineral
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Ruby (or potential synthetic/imitation)
Corundum (Al2O3)
gemstone
Eye Agate
Chalcedony (SiO2)
sedimentary
Crinoid Columnal Fossil
Crinoid ossicle (Class Crinoidea)
sedimentary
Spherulitic Agate / Moss Agate
Chalcedony (SiO2) with mineral inclusions
mineral
River Quartzite Siltstone
Quartz-rich Meta-siltstone (SiO2 dominated)
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Petrified Wood
Silicon Dioxide (SiO2) permineralized organic matter
sedimentary
Diamond
C (Native Carbon)
gemstone
Diamond (Faceted)
Carbon (C)
gemstone
Painted River Rock (likely Quartzite or Granite)
Quartzite or Granitic Gneiss (painted)
metamorphic
Siltstone or Limestone Beach Pebble
Siltstone / Micritic Limestone
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
River Pebble (likely Quartzite or Siltstone)
Sedimentary Clast (SiO2 based)
sedimentary
Polished serpentine pendulum
Serpentine-group minerals, chiefly antigorite/lizardite; approximate formula Mg₃Si₂O₅(OH)₄
metamorphic
Jadeite (Jade Ring)
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Likely diamond accent
Diamond (crystalline carbon, C)
gemstone
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Fossiliferous Limestone (Crinoid stem fragments)
Bioclast-bearing Carbonate Rock (Caco3)
fossil
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Anyolite (Ruby in Zoisite)
Zoisite with inclusions of Corundum; Ca2Al3(SiO4)3(OH) + Al2O3
metamorphic
Fossilized Sea Urchin Spines
Echinoidea (Cidaroid spines)
sedimentary
Diamond
Carbon (C)
gemstone
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Chondrite Meteorite
Stony Meteorite (Chondrite)
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Crinoid Fossil Limestone
Crinoidal Limestone (Calcite / CaCO3)
sedimentary
Fossiliferous Limestone
Limestone with embedded fossil cross-section
sedimentary
Ruby in Fuchsite
Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic