What does mean metallic in mineralogy ?
Metallic : definition
In mineralogy, this adjective commonly designates opaque minerals in transmitted light. However, this is a term to be avoided because it is a source of confusion, all "metallic" minerals not being opaque, and all opaque minerals not necessarily carrying metallic elements.
"Metallic" also designates a brilliant luster reminiscent of that of metals. It is usually typical of minerals with a very high refractive index (greater than 3), which is the case for most sulphides (galena, pyrite, chalcopyrite, etc...), and obviously native metals (copper, silver, gold, etc...).
"Metallic" also designates a brilliant luster reminiscent of that of metals. It is usually typical of minerals with a very high refractive index (greater than 3), which is the case for most sulphides (galena, pyrite, chalcopyrite, etc...), and obviously native metals (copper, silver, gold, etc...).
Chalcopyrite from Madan, Bulgaria
Pyrite from Huanzala Mine, Bolognesi, Ancash, Peru
Galena from Missouri, USA