Epidote-bearing Rock
Epidote / Silicate mineral aggregate
metamorphic
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Basalt
Extrusive Igneous Rock
igneous
Inukshuk Rock Sculpture (composed of Granite, Slate, and Amethyst)
Silicon Dioxide (Amethyst portion, SiO2) with mixed silicate rock assemblage
mineral
Porphyritic Basalt or Porphyry
Porphyritic Igneous Rock
igneous
Sandstone
Sedimentary Clastic Rock (Quartz-rich)
sedimentary
Quartzite
Metamorphic Quartzite
metamorphic
Chert / Flint
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper Cube
SiO2 (microcrystalline quartz)
mineral
Agate
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Silicon dioxide (SiO2)
sedimentary
Heated Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2), quartz variety
mineral
Ruby
Corundum (Al2O3:Cr)
gemstone
Quartz
Silicon Dioxide (SiO2)
mineral
Sea Shell (Mollusk Shell)
Calcium Carbonate (Aragonite/Calcite)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline quartz (SiO2) with impurities
sedimentary
Agate Nodule
Chalcedony (SiO2)
sedimentary
Red Sandstone with Reduction Spot
Quartzose Sandstone with a Leach/Reduction Spot
sedimentary
Blue Chert
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Basalt Metate
Vesicular Basalt
igneous
Volcanic Scoria (Metate)
Vesicular Basalt
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Sapphire
Corundum (Al2O3)
gemstone
Granite Pebble
Intrusive Igneous Rock
igneous
Amazonite
Microcline (Potassium Feldspar), KAlSi3O8
mineral
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) fossil
fossil
Limonite and Goethite Iron Ore
Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)
mineral
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Green Jasper / Plasma
Microcrystalline Quartz (Chalcedony), SiO2 with inclusions
gemstone
Petrified Wood
Silicified Wood / Xylopal
fossil
Red Jasper and Green Aventurine
Silicon dioxide (SiO2)
mineral
Green Aventurine
Quartz with fuchsite inclusions (SiO2)
mineral
Jasper and Quartz Pebble
Silicon dioxide (SiO2) microcrystalline quartz variety
sedimentary