A Geoscience Digital Image Library

TitlePlatinum in graywacke
DescriptionThe dark colored mineral in this 1 cm wide graywacke sample is native platinum. Native platinum is usually found in mafic and ultramfic igneous rocks or in sediments derived from such rocks. It commonly concentrates in placers. It tends to be impure, containing small to large amounts of other elements, such as gold, copper, nickel, and iron. Often it contains other metals of the platinum grup: iridium, osmium, rhodium, and palladium. Most platinum specimens contain traces of iron, which may cause it to be slightly attracted to magnetic fields.
LocationUSA ▹ Montana. Near Gold. Court House Mine.
PhotographerDarla Sondrol. 2001-06-27.
CollectionUniversity of North Dakota Mineralogy Collection #41.
Key wordsPlatinum, Graywacke, Montana
Tech details204 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number922