Basalt (Tumbled Massage Stone)
Extrusive Igneous Rock
igneous
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Komatiite Drill Core
Ultramafic Volcanic Rock (Spinifex Texture)
igneous
Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
gemstone
Chert
Microcrystalline quartz (SiO2)
sedimentary
Dumortierite Quartz
Dumortierite-bearing Quartz (SiO2 with Al7BO3(SiO4)3O3)
mineral
Serpentine
(Mg,Fe)3Si2O5(OH)4
metamorphic
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Chert
Microcrystalline quartz (SiO2)
sedimentary
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Hematite Nodule
Hematite (Fe2O3)
mineral
Galena
Lead Sulfide (PbS)
mineral
Basalt Pebble
Extrusive Igneous Rock
igneous
Chert (or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Purple Lava Rock / Vesicular Basalt
Vesicular Basalt (Mafic Extrusive Igneous Rock)
igneous
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Basalt
Extrusive igneous rock
igneous
Quartzite
Metamorphic Quartzite
metamorphic
Petrified Wood
Silicified wood (Quartz replacement, SiO2)
fossil
Fossilized Oyster Shell
Gryphaea or Exogyra (Family Ostreidae)
fossil
Hematite
Iron(III) oxide (Fe2O3)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chert
Cryptocrystalline quartz (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Peridot
Olivine (Mg, Fe)2SiO4
gemstone
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Flint Arrowhead
Cryptocrystalline quartz (Chert/Flint, SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Pumice
Pumice
igneous
Tiger's Eye
Silicon Dioxide with Crocidolite inclusions (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Limonite Concretion
Limonite (FeO·nH2O)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Shark Tooth Fossil
Carcharhiniformes or Lamniformes (order level fossil)
fossil
Quartz Geode
Silicon dioxide (SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Unidentified dark pebble
Unknown
unknown
Omarolluk
Omarolluk Formation greywacke concretion
sedimentary