Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
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Chert (Hagstone/Adder Stone)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Slag (Industrial Byproduct)
Anthropogenic Vitreous Silicate material
igneous
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Coquina
Biogenic Limestone (Calcite/Aragonite, CaCO3)
sedimentary
Basalt River Stone
Basaltic Igneous Rock
igneous
Black Onyx
Chalcedony (Silicon Dioxide, SiO2)
gemstone
Black Onyx or Dyed Agate Node
Cryptocrystalline Quartz (SiO2)
mineral
Black Onyx
Silicon Dioxide (SiO2) with cryptocrystalline structure
mineral
Amethyst (Rough Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Chalcopyrite (Peacock Ore)
Chalcopyrite (CuFeS2)
mineral
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (with Iron Oxide staining)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Titanium Quartz (Rough)
Titanium-included Silicon Dioxide (SiO2 + Ti)
mineral
Chert with Epidote and Jasper inclusions
SiO2 (Silicon Dioxide) with Ca2(Al, Fe)3(SiO4)3(OH) inclusions
sedimentary
Black Onyx
Cryptocrystalline Quartz (SiO2) with carbon/iron impurities
mineral/sedimentary
Coquina
Biogenic Limestone (Calcite/Aragonite base, CaCO3)
sedimentary
Chert Nodule (with Flint core)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic plutonic rock (dominated by SiO2, Al2O3, K2O, Na2O)
igneous
Pyrite in Shale
Iron Disulfide (FeS2) in Sedimentary Shale
mineral
Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
sedimentary
Slate
Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)
metamorphic
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Amber
Fossilized Tree Resin (Succinate)
mineral
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
mineral
Amethyst
Amethyst (SiO2)
mineral
Dragon Vein Agate (Dyed)
SiO2
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Agate (River Pea)
Microcrystalline Chalcedony (SiO2)
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities
mineraloid
Peacock Ore
Bornite (Cu5FeS4)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Dyed Agate
SiO2 (Silicon Dioxide)
Mineral
Granite
Granite (Felsic Plutonic Rock)
Igneous
Diamond
Native Carbon (C)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase)
igneous