Metamorphic Or Sedimentary

Blue Dumortierite Quartz

AlAl6BSi3O18 (Dumortierite) within SiO2 (Quartz)

Feldspar (Orthoclase/Potassium Feldspar)

KAlSi3O8 (Potassium Aluminum Silicate)

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

Galena

Lead(II) sulfide (PbS)

Citrine

Silicon Dioxide (SiO2) with iron impurities

Quartz (Iron-Stained or Milky Quartz)

Silicon Dioxide (SiO2)

White Moonstone (Feldspar)

Potassium aluminum silicate (KAlSi3O8)

Golden Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Garnet

Garnet Group (Silicate Minerals), formula varies e.g., Almandine Fe3Al2(SiO4)3

Muscovite Mica (Granitic Pegmatite)

Muscovite - KAl2(AlSi3O10)(OH)2

Corundum (Ruby variety)

Aluminium oxide (Al2O3)

Rough Ruby (Corundum) in Zoisite Matrix

Al2O3 (Aluminum Oxide) with Ca2Al3(SiO4)3(OH)

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

Milky Quartz

Silicon Dioxide (SiO2)

Serpentine

Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Rough Quartz

Silicon Dioxide (SiO2)

Amazonite

Microcline (KAlSi3O8) with Pb impurities

Yellow Quartz (Citrine or Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Grey Agate

Silicon Dioxide (SiO2) - variety: Agate/Chalcedony

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Green Aventurine

SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)

Banded Agate

Cryptocrystalline Quartz (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Quartz / Iron-Stained Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions/staining

Quartz Pebble

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO₂)

Tiger's Eye (Inlaid in a band)

SiO2 (Silicon Dioxide with Crocidolite inclusions)

Moonstone (specifically White Moonstone/Adularia)

Potassium aluminum silicate ((K,Na)AlSi3O8)

Smoky Quartz

Quartz (Silicon Dioxide), Formula: SiO2

Citrine

Silicon dioxide (SiO2)

Blue Sapphire

Corundum (Al2O3 with trace amounts of iron and titanium)

Emerald in Matrix

Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Green Aventurine (Carved)

Silicon Dioxide (Quartz variant) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O(OH)2)

Rutilated Quartz

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

Citrine (Yellow Quartz)

Silicon Dioxide (SiO2)

Serpentine

Antigorite / Lizardite / Chrysotile [(Mg,Fe)3Si2O5(OH)4]

Quartz (River Cobble)

Silicon Dioxide (SiO2)

Citrine

Quartz (Silicon Dioxide - SiO2)

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Rough Quartz (Grey-Green)

Silicon Dioxide (SiO2)