A Geoscience Digital Image Library

TitleMuscovite, Hill City, South Dakota
DescriptionThis sample of muscovite is from a mine near Hill City, South Dakota. It is about 6 cm across. The sample also contains small amounts of cassiterite, but the cassiterite is hard to see. This rock has been described as a greisen, meaning that it formed by hydrothermal alteration due to water vapor containing fluorine.
Geologic provinceBlack Hills
LocationUSA ▹ South Dakota. Near Hill City. Black Hills.
PhotographerShannon Heinle. 2001-02-09.
CollectionUniversity of North Dakota Mineralogy Collection.
Key wordsmuscovite, South Dakota, Black Hills, cassiterite, greisen
Tech details722 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number39