Mineral

Druzy Quartz on Limestone

Silicon Dioxide (SiO2)

Epidotite (Unakite-related Epidote)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Quartz (specifically Clear Quartz with iron/hematite staining)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Limonite after Marcasite (Propeller Conchoid)

Goethite/Limonite pseudomorph after Marcasite (FeO(OH)·nH2O)

Nuummite

Orthoamphibole (Gedrite-Anthophyllite series)

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Sandstone with Liesegang Rings

Clastic Sedimentary Rock with Iron Oxide Precipitates (SiO2 + Fe2O3)

Amethyst

Amethyst (Varietal of Quartz), SiO2 with traces of Iron (Fe3+)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Smoky Quartz

Smoky Quartz (SiO2)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide with impurities), SiO2

Chalcanthite (Likely Synthetic/Lab-Grown)

Hydrated copper(II) sulfate (CuSO4·5H2O)

Labradorite

Labradorite (Plagioclase Feldspar Series) - (Ca, Na)(Al, Si)4O8

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Labradorite

Labradorite (Ca, Na)(Al, Si)4O8

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Biotite / Black Mica

K(Mg,Fe)3(AlSi3O10)(F,OH)2

Quartz Vein in Siltstone

SiO2 (Quartz) on clastic sedimentary matrix

Amethyst (Tumbled)

Silicon Dioxide (SiO2) with iron impurities

Selenite (Satin Spar)

Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Ocean Jasper

Orbicular Jasper/Microcrystalline Quartz (SiO2)

Ferruginous Quartz

Quartz (Silicon Dioxide) with Iron Inclusion, SiO2

Gold-bearing Quartz

Native Gold (Au) in Quartz (SiO2) matrix

Dragon Blood Jasper (Epidote with Piedmontite or Quartz)

Epidote-rich Quartzite / SiO2 with (Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))

Amazonite

Microcline (KAlSi3O8)

Tiger's Eye

Silicon Dioxide (SiO2) with iron oxide inclusions

Lapis Lazuli

Lapis Lazuli (Complex silicate mineral mixture primarily Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Quartz Geode (Druzy Quartz)

Silicon Dioxide (SiO2)

Larimar

Pectolite (NaCa2Si3O8(OH))

Epidosite

Epidosite (consisting primarily of Epidote Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz SiO2)

Amethyst

Silicon dioxide / Violet Quartz (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Amethyst

Silicon dioxide (SiO2) with iron impurities