• Grand Palace

    Great Basin

    National Park Nevada

There are park alerts in effect.
show Alerts »
  • Snake Creek Road and Campsites Closed

    The Snake Creek Road will be closed from the park boundary into the park to begin work on campsites, trails and restroom improvements. Work will continue until snow closes the project. Work will resume in Spring 2015.

  • Astronomy Programs to Resume August 23rd

    After a safety review Astronmy Programs will begin again on a trial basis on August 23rd. More »

  • Road Work at Great Basin National Park

    Beginning July 8, 2014 and continuing through the end of August there will be road work at Great Basin National Park on paved roads throughout the park. Delays of 10 minutes or less may occur. Updated 8/12/2014 More »

Moonmilk (Hydromagnesite)

moonmilk deposits
Moonmilk deposits seen along the 90 Minute Tour of Lehman Caves.
NPS PHOTO Scott babinowich
 
Moonmilk: The Healing Power of Caves
Moonmilk is a white formation that looks like powder when dry or cottage cheese when wet. There is a lot of it in the Rocky Road and on the ceiling in the Inscription Room. Moonmilk can be a combination of different (mostly carbonate) minerals. Some common minerals composing moonmilk are calcite, aragonite and hydromagnesite. Humans have used moonmilk as medicine to stop bleeding, induce a mother's milk, and for ulcers. There are several theories for the formation of moonmilk. One is that bacteria play a role in its origins. Another is that the moonmilk is deposited directly from water the same way other speleothems are, but for some reason the crystals never grow large or connected.

Did You Know?

Bonneville Cutthroat Trout

The Bonneville cutthroat trout is the only trout native to Great Basin National Park and East Central Nevada. Ancestors of the current Bonneville cutthroat trout were abundant in ancient Lake Bonneville 16,000 to 18,000 years ago, the remnant of what is now the Great Salt Lake in Utah.