Jasper
Microcrystalline quartz (SiO2)
sedimentary
Category
Mineral (Or Mineraloid If Microcrystalline)
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Jasper (likely river-worn)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet.
fossil
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Iron-rich jasper or hematite-bearing chert
Microcrystalline quartz (SiO₂) with hematite/goethite (Fe₂O₃/FeO(OH))
sedimentary
Tumbled brecciated jasper
Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble (Jasper/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Dalmatian Stone
Peralkaline rhyolite
igneous
Fossil-bearing Sedimentary Rock
Sedimentum cum fossili
fossil
Limonite with Hematite
Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Tree Agate
Silicon Dioxide (SiO2) with Chlorite/Manganese inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Leopard Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Kidney Stone (Urolith / Calcium Oxalate Stone)
Calcium Oxalate Monohydrate (Whewellite) / Calcium Oxalate Dihydrate (Weddellite)
mineral
Dyed Agate
SiO2 (Silicon Dioxide) - Chalcedony variety
Mineral
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Limonite Ironstone
Goethite-Limonite concretion / Iron oxide
sedimentary
Red Jasper with Quartz Veining
Jasper (Silicon Dioxide, SiO2) with Quartz (SiO2) inclusions
sedimentary
Generic Pebble / Small Rock Fragment
Lithic fragment / Weathered rock particle
sedimentary
Hag Stone
Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes
sedimentary
Quartzite with inclusions
Quartzite (SiO2)
metamorphic
Agate Geode Slice with Druzy Quartz
Silicon Dioxide (SiO2) - Banded Chalcedony with Quartz
mineral
Amygdaloidal Basalt with Agate/Zeolite Amygdules
Basalt (extrusive igneous rock) containing secondary mineral fillings
igneous
Banded Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Limonite Concretion
FeO(OH)qnH2O (Hydrated iron(III) oxide-hydroxide mixture)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Vuggy or Fossilliferous)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint Nodules)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite / Ironstone
FeO(OH)·nH2O
sedimentary
Limonite or Ironstone Nodule
Hydrated iron oxide-hydroxide (FeO(OH)·nH2O)
mineral
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble with Quartz Vein
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and silicate minerals
sedimentary