Petrified Wood
Silicified Wood (SiO2)
sedimentary
Category
Mineral And Organic Gemstone
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Carbonaceous Chondrite (CV3 type)
Carbonaceous Chondrite (CV3 group)
meteorite
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicon Dioxide (SiO2)
fossil
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8
mineral
Amber
Succinite (C10H16O)
mineral
Moss Agate
Cryptocrystalline Quartz (SiO2 with manganese or iron oxide inclusions)
mineral
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Amber with Inclusion
Succiniferous fossil resin (C10H16O)
mineraloid
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Chert (specifically Blue Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Flint (Chert Node)
Silicon Dioxide (SiO2)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Tiger's Eye
Silicon Dioxide (SiO2) with fibrous inclusions
mineral
Jasper with Quartz Vein
Silicon Dioxide (SiO2) with impurities
sedimentary
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2)
sedimentary
Chert (vuggy variety)
Microcrystalline silica (SiO2)
sedimentary
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
mineral
Chert / Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (Green Chert/Jasper)
Chert (primarily Microcrystalline Quartz, SiO2)
sedimentary
Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)
Ammonoidea
sedimentary
Chert (specifically Yellow/Honey Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites (Extinct genus of Tabulate Coral)
sedimentary
Jasper (Petrified Wood variant)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Ironstone Concretion (Limonite/Hematite Nodules)
Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)
sedimentary
Amber
Amber (Amorphous Organic Hydrocarbon)
mineral
Dendritic Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Organic Gemstone (Sedimentary classification)
Amazonite
K(AlSi3O8) - Microcline
mineral
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Limonite (Iron Ore)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral