Mineral (Metamorphic Pseudomorph)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Limonite/Goethite (Iron Ore)

Hydrous ferric oxides (FeO(OH)·nH2O)

Blue Tiger's Eye

Riebeckite (crocidolite variety)

Blue Tiger's Eye

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

Limonite (Gozzany Iron)

Limonite (FeO(OH)·nH2O)

Nephrite Jade

Nephrite

Limonite / Ironstone Nodule

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

Limonite (Iron Ore)

Limonite (̑FeO(OH)·nH₂O)

Limonite (Iron Stone/Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Limonite after Pyrite (Pseudomorph)

FeO(OH)·nH2O following FeS2

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)

Limonite (Iron Ore)

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

Azurite

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

Limonite (Iron Stone/Gossen)

Limonite (FeO(OH)·nH2O)

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

Chrysocolla

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

Goethite

Goethite (α-FeO(OH))

Limonite (Iron Ore)

Hydrous ferric oxides (FeO(OH)·nH2O)

Limonite

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

Pyrite with Limonite/Goethite Alteration (Pseudomorph)

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

Red Tiger's Eye

SiO2 (Silicon Dioxide) - Pseudomorph of Quartz after Crocidolite

Tiger's Eye (Rough Slab)

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

Limonite (Bog Iron)

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

Azurite and Malachite on Matrix

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

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

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

Epidote

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Epidote

Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Limonite (also known as Yellow Ochre or Brown Hematite)

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

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

Epidote

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

Garnet Schist

Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)

Staurolite

Staurolite (Fe2+2Al9Si4O23(OH))

Blue Apatite

Apatite, Ca5(PO4)3(F,Cl,OH)

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

Epidote

Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Magnetite

Magnetite (Fe3O4)

Rhodonite

Manganese silicate (MnSiO3)

Corundum

Corundum (Aluminium oxide, Al2O3)