Sand and Gravel (Quartz-rich)
Unconsolidated fluvial/beach sediment (primarily Silica/SiO2)
sedimentary
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Red Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Banded Sandstone (River Pebble)
Arenite (SiO2 primarily)
sedimentary
Sandstone and Quartzite Specimens
SiO2 with varying mineral/clastic inclusions
sedimentary/metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Natural Gold Nugget
Native Gold (Au)
mineral
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
sedimentary
White Howlite
Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Aura Quartz (Rainbow Quartz)
Silicon Dioxide (SiO2) with metallic vapor coatings
mineral
Chert
Chert (Microcrystalline Quartz)
sedimentary
Kidney Stone
Calcium Oxalate (CaC2O4), Uric Acid, or Struvite
mineral
Chalky Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Ammonite Fossil
Ammonoidea (Calcium carbonate or Pyrite replacement)
sedimentary
Milky Quartz with Nephrite Jade
Silicon Dioxide (SiO2) with Ca2(Mg,Fe)5Si8O22(OH)2
mineral/metamorphic
Chalcedony (specifically Agate or Carnelian)
Silicon Dioxide (SiO2)
mineral
Fossiliferous Chert (Chert with Crinoid Stem Impression)
Chert (SiO2) with fossil Anthozoan or Crinoid columnals
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
Fossilized Shark Tooth
Otodus sp. (approximate genus) / Hydroxyapatite fossil
sedimentary
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) with Quartz crystals
sedimentary
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Fossil Shark Tooth
Carcharodon sp. (likely Otodus or similar Lamniformes order)
sedimentary
Rose Quartz
Rose Quartz (SiO2)
mineral
Quartzite
Quartzite (Metamorphic Quartz Arenite)
metamorphic
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Black Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Pink Quartzite
Quartzite (SiO2) with trace Iron Oxides
metamorphic
Red Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Quartzite with Quartz Veining
Meta-quartzite (composed primarily of SiO2)
metamorphic
Amber
Succinates (C10H16O)
mineraloid
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Amber
Succinates
mineraloid
Snowflake Obsidian
Volcanic Glass (spherulitic obsidian)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Clear Quartz (Cut/Faceted Gemstone)
Silicon Dioxide (SiO2)
gemstone