Amethyst
Silicon Dioxide (SiO2) containing iron impurities
mineral
Category
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Botryoidal Agate / Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
minerals
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (complex silicate mineral group (Mg,Fe)3Si2O5(OH)4)
metamorphic
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
mineral
Red Jasper (Brecciated Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Tiger's Eye (likely Hawk's Eye variant)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Chert Pebble with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Peridot
Olivine ((Mg, Fe)2SiO4)
Mineral
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Red Jasper
Chalcedony/Quartz (SiO2) with iron inclusions
mineral
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Amethyst (Raw Cluster)
Silicon Dioxide with iron impurities (SiO2)
mineral
Carnelian
Carnelian (Microcrystalline Quartz, SiO2 with Fe2O3 impurities)
mineral
Amber
Fossilized Tree Resin (Amorphous Hydrocarbon)
Mineral
Quartzite Cobble
Meta-quartzite (SiO2)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Gneiss
High-grade regional metamorphic rock
metamorphic
Sandstone (River Pebble)
Arenite (SiO2 based)
sedimentary
Dyed Dalmatian Stone
Aplite (Alkali-feldspar granite) with Arfvedsonite
igneous
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions of Chlorite, Manganese, or Iron
mineral
Galena
Lead(II) sulfide (PbS)
mineral
Unakite (bottom) and Sodalite (top)
Epidotized Granite (Unakite) and Sodium Aluminum Silicate Chloride (Sodalite)
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
mineral
Turquoise (likely Stabilized or Dyed Howlite/Magnesite)
Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Yellow Jasper
Chalcedony (Silicon Dioxide with iron inclusions), SiO2
sedimentary
Quartz Vein in Siltstone
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
metamorphic
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineralological variety
Pyrite
Iron Disulfide (FeS2)
mineral
Red Sandstone
Ferruginous Sandstone (formula varies, primarily SiO2 with Fe2O3)
sedimentary
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Green Fluorite
Fluorite (Calcium Fluoride) - CaF2
mineral
Quartzite
Quartzite (chiefly SiO2)
metamorphic