Mineral (Metamorphic Pseudomorph)

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Blue Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of asbestiform silicates)

Hawk's Eye (Blue Tiger's Eye)

Quartz (fibrous crocidolite variety)

Tiger's Eye

Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Blue Tiger's Eye (Hawk's Eye)

Silicified Crocidolite (Silicon Dioxide with inclusions of Crocidolite), SiO2

Limonite after Pyrite (Pseudomorph)

FeO(OH)·nH2O following FeS2

Tiger's Eye (commonly referred to as Blue/Gold Tiger's Eye)

Tiger's Eye is a variety of Chalcedony (cryptocrystalline quartz), SiO2, exhibiting chatoyancy. The blue variety is often called Hawk's Eye.

Tiger’s eye

Quartz variety, primarily silicon dioxide (SiO₂); fibrous quartz pseudomorph after crocidolite asbestos

Blue Tiger's Eye

Riebeckite (crocidolite variety)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Limonite (Gozzany Iron)

Limonite (FeO(OH)·nH2O)

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)

Tiger's Eye and Hematite

Quartz (SiO2) with Crocidolite inclusions and Hematite (Fe2O3)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Gold-bearing Quartz and Pyrite

Auriferous Quartz (SiO2 + Au) with Pyrite (FeS2)

Malachite

Copper carbonate hydroxide [Cu2CO3(OH)2]

Limonite (Iron Stone/Gossen)

Limonite (FeO(OH)·nH2O)

Limonite (Iron Stone/Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Tiger's Eye

Silicon dioxide (Quartz pseudomorph after crocidolite), SiO2

Nephrite Jade

Nephrite

Tiger's Eye

Fibrous Quartz (SiO2) with Limonite

Limonite (Iron Ore)

Limonite (Hydrous ferric oxides), generic formula FeO(OH)·nH2O

Red Tiger's Eye

Pseudomorph of Quartz after Crocidolite (Silicon Dioxide: SiO2)

Chrysocolla

Hydrated copper silicates (Cu, Al)2H2Si2O5(OH)4·nH2O

Azurite

Azurite (Cu3(CO3)2(OH)2)

Spinifex Texture Komatiite

Komatiite (Ultramafic Volcanic Rock)

Goethite

Goethite (α-FeO(OH))

Desert Rose

Gypsum (CaSO4·2H2O) or Baryte (BaSO4) rosette

Acicular Azurite (indicated by deep blue, fibrous/fuzzy appearance)

Azurite (Copper Carbonate Hydroxide) - Cu3(CO3)2(OH)2

Glendonite (Calcite Pseudomorph after Ikaite)

Calcite (CaCO3) pseudomorph after Ikaite (CaCO3·6H2O)

Red Tiger's Eye

Silicified Crocidolite (SiO2 with iron oxide inclusions)

Limonite (Iron Ore)

Hydrous ferric oxides (FeO(OH)·nH2O)

Pyrite with Limonite/Goethite Alteration (Pseudomorph)

Iron Sulfide (FeS2) transitioning to Hydrated Iron Oxides (FeO(OH)·nH2O)

Tiger's Eye

Silicon Dioxide (Quartz pseudomorph after crocidolite), SiO2

Limonite

Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)

Tiger's Eye (Rough Slab)

Pseudomorph of Quartz after Crocidolite (SiO2 with Fe-containing inclusions)

Red Tiger's Eye

SiO2 (Silicon Dioxide) - Pseudomorph of Quartz after Crocidolite

Azurite and Malachite on Matrix

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2

Tiger's Eye (and Hematite/Jasper Matrix)

SiO2 (Pseudomorph of Quartz after Crocidolite) with Hematite/Magnetite

Blue Tiger's Eye

Silicon Dioxide (SiO2) with Crocidolite inclusions

Petrified Wood

Silicified wood (Quartz pseudomorph after wood)