Editing Neihart, Montana (section)

===Geology===
The Neihart area is rich in mineral deposits.<ref name="tent61">Soderberg and Soderberg, p. 61.</ref> [[Gold]], [[lead]], [[sapphire]]s, [[silver]], and [[zinc]] have all been discovered and mined in the area.<ref name="tent61" /> Much of the exposed rock in the area is dated to the [[Precambrian]] era, or around or before 542 million BC.<ref name="tent61" /> Rocks in the area belong to what is known as the [[Belt Supergroup]] and rest against [[Gneiss|granitic gneiss]].<ref>Rankama, p. 173.</ref> [[Amethyst]] and marine fossils are common in the area.<ref name="Federal271">Federal Writers' Project, p. 271.</ref> Pinto diorite, a red-and-green spotted [[diorite]], is found in large quantities in the area.<ref name="Federal271" />

The area is one of only three places in the world where Neihart [[quartzite]] (a reddish, coarse-grained [[sandstone]] with interbedded dark-green sandstone and [[shale]]) may be found. The rock unit was named for the locality.<ref>Rankama, p. 189.</ref>