Blue glass-like gemstone specimen (likely dyed or synthetic quartz)
Uncertain; possibly blue-dyed quartz or synthetic glass, not confidently identifiable from the image
gemstone
Category
Anthropogenic (Man Made Material Processed By Nature)
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Quartzite Pebble
Quartzite (SiO2 with minor impurities)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Diamond (or Cubic Zirconia simulant)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Quartzite
Quartzite
Metamorphic rock
Fancy Jasper
Chalcedony (cryptocrystalline quartz) with inclusions
Mineral
Granite, possibly granodiorite
Coarse-grained felsic plutonic rock; chiefly quartz (SiO₂), potassium feldspar and plagioclase feldspar, with biotite and/or hornblende
igneous
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Banded Gneiss
Gneiss (pronounced 'nice')
metamorphic
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Coral (Petrified Coral)
Lithostrotionella (example genus) / Scleractinia
fossil
Dinosaur Claw Fossil
Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)
fossil
Mosasaur Tooth
Mosasaurus sp.
fossil
Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary
Cubic Zirconia (Set in Jewelry)
Zirconium Dioxide (ZrO2)
gemstone
Fossil Shark Tooth
Carcharodon or Carcharias fossil (Vertebrate Fossil)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Flower Jasper
Agatized Fossil Coral / Chalcedony (SiO2)
sedimentary
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Serpentine
Antigorite/Chrysotile group (Mg3Si2O5(OH)4)
metamorphic
Brecciated jasper (likely red-and-cream jasper)
Jasper, an opaque microcrystalline variety of quartz; primarily cryptocrystalline SiO₂ with iron-oxide staining and possible chalcedony/quartz veining
gemstone
Petrified Wood (Silicified Fossil)
Silicified Wood (SiO2)
sedimentary
Chert (Flint variety)
Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) fossil
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Bivalve Fossil (Clam)
Class Bivalvia (Mollusca)
fossil
Chert Nodule (Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
mineral
Peridotite
Peridotite (primarily Olivine and Pyroxene)
igneous
Schist
Schist (various compositions)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone
Sandstone (lithified sand)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Halite (Rock Salt)
Halite; NaCl (Sodium Chloride)
Mineral