Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2 - a variety of actinolite, an amphibole mineral); Jadeite (Na(Al,Fe3+)Si2O6 - a pyroxene mineral)
Metamorphic rock (for both Nephrite and Jadeite)
Category
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Amethyst
SiO2 (Silicon Dioxide) - a variety of Quartz
Mineral
Likely blue glass or synthetic gemstone jewelry
Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass
gemstone
Fossil Coral
Scleractinia (Stony Coral) fossil
fossil
Diamond
C (Native Carbon)
gemstone
Carnelian Agate
Silicon Dioxide (SiO2) - Carnelian variety of Chalcedony
mineral
Red Sandstone
Quartz Arenite (iron-stained) / SiO2
sedimentary
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Moonstone
Orthoclase feldspar, (K,Na)AlSi3O8
gemstone
Peridot
Olivine ((Mg,Fe)2SiO4)
gemstone
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
gemstone
Moonstone
Potassium aluminum silicate (KAlSi3O8)
gemstone
Peridot
Olivine ((Mg, Fe)2SiO4)
gemstone
Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar), (Na,Ca)(Si,Al)4O8
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Bloodstone
Chalcedony (Variety: Bloodstone / Heliotrope), SiO2
mineral
Tumbled Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
gemstone
Opal
Hydrated silicon dioxide (SiO2·nH2O)
gemstone
Amethyst (Faceted Gemstone)
Silicon Dioxide (SiO2) with iron impurities
gemstone
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Iron-Nickel Meteorite fragment
Siderite (meteoritic iron), composed primarily of Kamacite (α-(Fe,Ni)) and Taenite (γ-(Fe,Ni))
mineral
Granite
Granite (a plutonic rock)
Igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Quartz (Jasper / Chert)
Silicon Dioxide (SiO2)
sedimentary
Green Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
gemstone
Hematite Nodule / Concretion
Hematite (Fe2O3)
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Tumbled carnelian/chalcedony
Cryptocrystalline quartz, SiO₂ (iron-bearing chalcedony)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Jasper
Silicon Dioxide (SiO2), microcrystalline quartz
sedimentary
Petrified Wood
Silicified wood / Permineralized wood (SiO2)
fossil
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Labradorite (Tumbled)
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral