PointofInterestRoadSigns.com - Yellowstone National Park - Emerald Spring

 

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Yellowstone National Park - Emerald Spring

 

Location of sign - the Norris Geyser Basin trail in Yellowstone National Park

 

Photo taken June 2008

Emerald Spring, Emerald Spring sign, Norris Geyser Basin Yellowstone National Park  

Close-up view of sign

 

Emerald Spring, Emerald Spring sign, Norris Geyser Basin Yellowstone National Park

Wide view of sign

 

Text of sign:

 

Emerald Spring

 

The Secret is Sulfur

 

A hot spring's color often indicates the presence of minerals.  In a clear blue pool, the water is absorbing all the colors of sunlight

except one - blue, which is reflected back to our eyes.  Here in Emerald Spring's pool, another factor joins with the light 

refraction to give the spring its color.  The 27-foot-deep pool (8 meters) is lined with yellow sulfur deposits.  The yellow color

from the sulfur combines with the reflected blue light, making the hot spring appear a magnificent emerald green.

 

Hot spring water and steam can dissolve and transport sulfur from underground.  The mineral can deposit and crystallize at the 

earth's surface - sometimes in hot spring pools. 

 

Graphics on the sign

 

In addition to the text there is a picture of crystallized sulfur in a hot spring pool.

 

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