PointofInterestRoadSigns.com - Yellowstone National Park - Emerald Spring


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 Welcome to Point of Interest Road Signs! A collection of photos of road and trail signs.  Click here for more Wyoming Signs


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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