Sedimentary Or Igneous (Secondary Formation)

Limonite (Iron Ore/Bog Iron)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Limonite

Limonite (Hydrated iron oxide mixture, FeO(OH)·nH2O)

Amethyst (as a jewelry accent)

Amethyst (Silicon Dioxide SiO2 with Iron impurities)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Chalcedony

Chalcedony (a microcrystalline variety of Quartz, SiO2)

Calcite

Calcite (Mineral; CaCO₃)

Agate

Agate (a cryptocrystalline variety of Quartz, SiO₂)

Brown Agate

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Carnelian

SiO2 (Microcrystalline Quartz / Chalcedony)

Quartz

Silicon Dioxide (SiO2)

Pyrite in Matrix (likely Quartz or Schist matrix)

Iron Sulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Carnelian

Carnelian (a variety of Chalcedony), SiO2 (Silicon Dioxide)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Apatite

Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Clear Quartz

Silicon Dioxide (SiO2)

Rough Quartz (likely Rose or Smoky variant)

Silicon Dioxide (SiO2)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

White Calcite

Calcium Carbonate (CaCO3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Yellow Agate / Chalcedony

Silicon Dioxide (SiO2)

Quartz (Milky or Citrine-tinted)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Yellow Agate

Agate (Varietal form of Chalcedony/Quartz, SiO2)

White Zircon

Zircon (Zirconium silicate, ZrSiO4)

Chalcedony with inclusions (Agate/Quartz)

Silicon Dioxide (SiO2)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Carnelian (Orange Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Pyrite in Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Sandstone (Muddy/Silty Variety)

Arenite with high silt/clay content (clastic sedimentary rock)

Red Jasper

Jasper (Silicon Dioxide: SiO2 with Iron oxide inclusions)

Peridot

Olivine (specific variety: gem-quality forsterite), (Mg,Fe)2SiO4

Moonstone

Orthoclase Feldspar (specifically showing adularescence)

Jasper

Silicon Dioxide (SiO2)

Pearl

Organic Mineral (CaCO3 with conchiolin)

Pearl (likely Freshwater or Akoya Cultured)

Aragonite / Conchiolin composite (CaCO3)