Chert (Iron-stained)
Chert (primarily Microcrystalline Quartz, SiO2)
sedimentary
Category
Mineral And Organic Gemstone
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Chert (with Quartz vein)
Chert (Silicon Dioxide, SiO2)
sedimentary
Lapis Lazuli
Complex mixture of minerals (lazurite, calcite, pyrite, and sodalite); (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Turquoise or Chrysocolla (Inlaid Jewelry)
Hydrated copper aluminum phosphate / Hydrated copper phyllosilicate
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Fairburn Agate
Cryptocrystalline Quartz (SiO2) with trace Iron Oxides
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Diamond (in Jewelry)
Carbon (C)
mineral
Larimar
NaCa2Si3O8(OH)
gemstone
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Turquoise
Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz
Silicon dioxide (SiO2)
Mineral
Olivine (Peridot)
Olivine (Magnesium Iron Silicate, (Mg,Fe)2SiO4)
mineral
Pink Opal / Peruvian Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
Mineral
Amazonite
Lead-bearing Microcline (KAlSi3O8)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Alexandrite in Matrix
Chrysoberyl (BeAl2O4 with Chromium impurities)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
Mineral
Pyrite in Quartz
Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Dalmatian Jasper
Peralkaline rhyolite with arfvedsonite inclusions
igneous
Amethyst (Purple), Sulfur (Yellow), and Blue Apatite
SiO2 (Quartz), S (Native Sulfur), Ca5(PO4)3(F,Cl,OH) (Apatite Group)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Rose Quartz
Silicon dioxide (SiO2)
mineral
Banded Jasper (possibly "Picture Jasper")
Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)
Sedimentary rock (specifically a chemical sedimentary rock, or a chert if considered purely mineral aggregate)
Hardpan Nodule / Ferruginous Sandstone
Ferruginous Sandstone (Fe-cemented sediment)
sedimentary
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Olivine
Magnesium Iron Silicate ((Mg, Fe)₂SiO₄)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities and natural irradiation
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Labradorite
Labradorite (Ca,Na)(Al,Si)4O8
mineral
Amazonite
K(AlSi3O8) - Microcline variant
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Labradorite (Feldspar)
Labradorite: (Ca,Na)(Al,Si)4O8
mineral