Pseudomorph
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In mineralogy, a pseudomorph is a mineral or mineral compound that appears in an atypical form, resulting from a substitution process in which the appearance and dimensions remain constant, but the or
Pseudomorph of goethite after pyrite
Silica pseudomorph after gypsum crystals and silicified serpulid polychaete tubes
Native copper pseudomorph after aragonite, with red cuprite and green malachite alteration
Cubic crystals of argentite transformed into acanthite (monoclinic), without any external visible change. Specimen from the San Juan de Rayas Mine, Guanajuato, Mexico. 3 cm.
Pyrite
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The mineral pyrite, or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula FeS2. Pyrite is the most abundant sulfide mineral.
Pseudomorph
…common in paleontology. Fossils are often formed by pseudomorphic replacement of the remains by mineral matter. Examples include petrified wood and pyritized gastropod shells. In biology, a pseudomorph is a cloud of mucus-rich ink released by many species of cephalopod. The name refers to the similarity in…
Intergrowth of lustrous, cubic crystals of pyrite, with some surfaces showing characteristic striations, from Huanzala mine, Ancash, Peru. Specimen size: 7.0 × 5.0 × 2.5 cm
Pyrite under normal and polarized light
An abandoned pyrite mine near Pernek in Slovakia