Organic Gemstone (Fossilized Resin)

Jasper

Jasper (Silicon Dioxide, SiO2)

Glauconitic Sandstone (or Greensand)

Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Green Jasper (with Quartz veining)

Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2

Banded Chert

Microcrystalline Quartz (SiO2)

Jasper (likely Brown or Brecciated)

Jasper (Silicon Dioxide, SiO2)

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8) with inclusions

Emerald with Matrix (Emerald in Mica Schist)

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Peridot

Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4

Diamond (appearing in jewelry)

Diamond (pure Carbon, C)

Diamond (or Cubic Zirconia)

Carbon (C) or Zirconium Dioxide (ZrO2)

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

Blue Sapphire

Corundum (Al2O3)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminium phosphate)

Amethyst

Amethyst (Silicon Dioxide, SiO2 with Iron impurities)

Amazonite

K(AlSi3O8), Microcline (potassium feldspar)

Red Jasper

Silicon dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Petrified Wood (Silicified Wood)

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Gastropod Fossil (Internal Mold)

Phylum Mollusca, Class Gastropoda (Steinkern)

Chert (specifically Jasper or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified wood (primarily Silicon Dioxide - SiO2)

Amethyst

Quartz (Silicon Dioxide with Iron impurities), SiO2

Turquoise (likely Sleeping Beauty variety or treated Howlite imitation)

Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Emerald in Matrix

Emerald (Beryllium Aluminum Silicate), Be3Al2(SiO3)6

Dragon Stone (Dragon Blood Jasper)

Epidote with Pietersite or Red Jasper inclusions (varied SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))

Sunstone

Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)

Sunstone

Plagioclase Feldspar (containing (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions)

Milky Quartz

Silicon Dioxide (SiO2)

Green Quartz (Prasiolite)

Silicon Dioxide (SiO2) with trace impurities

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Pallasite Meteorite

Pallasite (ST-class)

Malachite with Chrysocolla

Copper carbonate hydroxide (Cu2CO3(OH)2) and Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Lapis Lazuli

Lapis Lazuli (Complex silicate: Na8[Al6Si6O24]Sn)

Diamond (or Cubic Zirconia simulant)

Carbon (C) or Zirconium Dioxide (ZrO2)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Peridot

Olivine (Mg, Fe)₂SiO₄

Moonstone

Orthoclase feldspar ((K,Na)AlSi3O8)

Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)