Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineral, Jewelry
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Amethyst
Silicon dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Geode
Quartz / Chalcedony nodule
sedimentary
Quartz (Chalcedony/Agate nodule)
Silicon dioxide (SiO2)
mineral
Lake Superior Agate
SiO2 (Quartz variety chalcedony)
gemstone
Quartz
Silicon Dioxide (SiO2)
mineral
Peach Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst Cluster
Silicon Dioxide (Quartz variety: Amethyst) - SiO2
mineral
Pyrite in Quartz
Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (SiO2)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Emerald in Quartz Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
gemstone
Citrine
Silicon Dioxide (SiO2)
gemstone
Amethyst (Rough)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Druzy on Matrix
Silicon Dioxide (SiO2)
mineral
Prehnite
Ca2Al2Si3O10(OH)2
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral
Lake Superior Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Citrine
Crystalline Quartz (SiO2) with iron impurities
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with chromium/vanadium impurities
mineral
Goldstone (Brown)
Aventurine glass
mineraloid (man-made)
Amethyst Stalactite Slice
Crystalline Quartz (SiO2) with trace Iron (Fe4+)
mineral
Botryoidal Hematite
Iron(III) oxide (Fe2O3)
mineral
Yellow Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Jasper
Silicon dioxide (Quartz variety), SiO2
sedimentary
Emerald (or possibly Green Glass / Slag)
Beryl (Be3Al2(SiO3)6)
gemstone
Jasper and Agate Mix
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amethyst
Silicon Dioxide (Quartz variety)
gemstone
Blue Aventurine
Quartz (SiO2) with inclusions
mineral
Agate Nodule / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Chevron Amethyst
Silicon Dioxide with Iron Impurities (SiO2)
mineral
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral