Mineral (Metamorphic Pseudomorph)

Polished tiger’s-eye

Tiger’s-eye, a quartz-rich variety of crocidolite pseudomorph (SiO₂ with iron oxides)

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 (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)

Blue Tiger's Eye

Riebeckite (crocidolite variety)

Tiger's Eye and Hematite

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

Tiger's Eye

Fibrous Quartz (SiO2) with Limonite

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Glendonite (Calcite Pseudomorph after Ikaite)

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

Fossil Coral (Petoskey / Favosites)

Favosites sp. / Hexagonaria sp. (Calcite/Silica pseudomorph)

Limonite (Iron Ore)

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

Gold-bearing Quartz and Pyrite

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

Tiger's Eye (and Hematite/Jasper Matrix)

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

Red Tiger's Eye

SiO2 (Silicon Dioxide) - Pseudomorph of Quartz after Crocidolite

Malachite

Copper carbonate hydroxide [Cu2CO3(OH)2]

Limonite (Iron Ore)

Hydrous ferric oxides (FeO(OH)·nH2O)

Polished tiger’s-eye

Chatoyant quartz, chiefly fibrous quartz pseudomorph after crocidolite; SiO₂

Polished tiger iron

Tiger iron; interbanded jasper, hematite/magnetite, and crocidolite pseudomorph (quartz-rich ironstone)

Red Tiger's Eye

Pseudomorph of Quartz after Crocidolite (Silicon Dioxide: SiO2)

Likely tumbled tiger’s-eye

Quartz variety with fibrous crocidolite pseudomorphs (SiO₂)

Spinifex Texture Komatiite

Komatiite (Ultramafic Volcanic Rock)

Petrified Wood

Silicified Wood (SiO2 / Quartz pseudomorph after wood)

Goethite

Goethite (α-FeO(OH))

Petrified Wood

Silicified wood (Quartz pseudomorph after wood)

Red Tiger's Eye

Silicified Crocidolite (SiO2 with iron oxide inclusions)

Chrysocolla

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

Azurite

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

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

Polished tiger’s-eye / iron-rich jasper

Quartz-rich chalcedony with crocidolite pseudomorphs and iron oxides; possibly brecciated jasper

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)

Nephrite Jade

Nephrite

Pyrite with Limonite/Goethite Alteration (Pseudomorph)

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

Tiger’s-eye

Quartz variety; fibrous pseudomorph of quartz after crocidolite, SiO₂

Tiger's Eye (Rough Slab)

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

Limonite

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

Coral fossil (likely fossilized reef coral)

Calcitic coral; commonly fossilized Scleractinia or related colonial coral

Tumbled tiger’s eye

Quartz variety, mainly SiO₂ with fibrous crocidolite pseudomorphs

Tumbled tiger’s-eye

Tiger’s-eye quartz, SiO₂ with fibrous crocidolite pseudomorphs

Limonite (Bog Iron)

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

Tumbled tiger’s-eye-rich quartzite

Quartzite, composed mainly of microcrystalline quartz (SiO₂) with fibrous crocidolite pseudomorphs and iron oxides

Blue Tiger's Eye

Silicon Dioxide (SiO2) with Crocidolite inclusions

Azurite and Malachite on Matrix

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