Basalt
Extrusive mafic igneous rock
igneous
Category
None
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Amethyst Geode
Amethyst (Silicon Dioxide), Formula: SiO2
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon dioxide (SiO2)
mineral
Quartz Pebble (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Silica/Silicon Dioxide, SiO2)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Arrowhead Artifact)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Opaque variety)
Silicon Dioxide (SiO2)
mineral
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Basalt pebble
Basalt
igneous
Handaxe with Inlaid Fossil Echinoid
Flint / Chert (SiO2) containing a fossil Conulus albogalerus
sedimentary (cryptocrystalline silica)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Limonite (Ironstone)
Limonite (mixture of hydrated iron(III) oxide-hydroxides)
mineral
Quartz (Milky or Druzy variety)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
White Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Petrified Coral (Agatized Coral)
Anthozoa (Agatized Fossil)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Banded Agate
Chalcedony (SiO2) with microcrystalline quartz
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Chert
SiO2 (Microcrystalline Quartz)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite River Pebble
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Gold
Native Gold (Au)
mineral
Sandstone (likely Conglomerate or Gritstone)
Arenite (SiO2 based)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Pink Sapphire
Corundum (Al2O3 with Chromium/Titanium/Iron traces)
mineral
Banded Iron Formation (Chert/Jasper)
Banded Iron Formation (BIF)
sedimentary
Quartz
SiO2 (Silicon Dioxide)
mineral
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral