Nature Bank

Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemicalformul. It is rare and valuable in finer grades and has been prized as a gem and ornamental stone for thousands of years owing to its unique hue. In recent times, turquoise, like most other opaque gems, has been devalued by the introduction of treatments, imitations, and synthetics onto the market. The substance has been known by many names, but the word turquoise.  Source

Saint Mary Lake is the second largest lake in Glacier National Park, in the U. S. state of Montana. Located on the east side of the park, the Going-to-the-Sun Road parallels the lake along its north shore. At an altitude of 4,484 feet, Saint Mary Lake's waters are colder and lie almost 1,500 feet  higher in altitude than Lake McDonald, the largest lake in the park, which is located on the west side of the Continental Divide. Here, the great plains end and the Rocky Mountains begin in an abrupt 5,000 feet altitude change.  Source

North Cascades National Park is a U.S. National Park located in the state of Washington. The park is the largest of the three National Park Service units that comprise the North Cascades National Park Service Complex. Several national wilderness areas and British Columbia parkland adjoin the National Park. The park features rugged mountain peaks and protects portions of the North Cascades range. Human history in the region now part of North Cascades National Park dates back to the end of the last glacial period, and the region has been continuously inhabited for at least the last 8-10,000 years. At that time, native American ancestors of Skagit tribes slowly advanced from Puget Sound into the interior mountainous region as the glacial ice retreated. Archeological evidence of continuous human presence in the North Cascades dates to 4,470 B.P. and rocks procured from sources in the region were used to manufacture stone tools and weapons for several millennia.  Source