Sea Glass
Amorphous Silicon Dioxide (Man-made glass weathered by nature)
mineral
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Greenstone
Metabasalt / Greenschist facies rock
metamorphic
Feldspar
Triclinic or Monoclinic Tectosilicate (e.g., KAlSi3O8)
mineral
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Pegmatite
Igneous Pegmatite (Quartz-Feldspar-Mica)
igneous
Granite
Granite (felsic intrusive igneous rock)
igneous
Granite
Intrusive Igneous Rock
igneous
Yellow Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Quartz Geode or Vein Quartz
Silicon Dioxide (SiO2)
mineral
Granitic Gneiss
Gneiss (Granite-derived)
metamorphic
Diabase (Dolerite)
Mafic intrusive igneous rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
mineral
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite / Arkose)
sedimentary
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Bauxite
Hydrated aluminium oxides mixture (primarily gibbsite, boehmite, and diaspore)
sedimentary
Chert (or Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Nut-stone / Cup-stone artifact)
Quartz Arenite / Worked Sedimentary Rock
sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Tree Agate
Chalcedony (SiO2)
gemstone
Tumbled Grey Agate
Silicon Dioxide (Chalcedony variety), SiO2
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Hematite (Fe2O3)
mineral
Lapis Lazuli
Complex silicate rock (primarily Lazurite: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
gemstone
Larimar
Pectolite (NaCa2Si3O8(OH))
gemstone
Yellow Aventurine
Quartz (Silicon Dioxide, SiO2) with inclusions
mineral
Rose Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Pink/Rose Quartz or Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Tumbled Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Basalt
Extrusive Igneous Rock
igneous