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Welcome
to Point of Interest Road
Signs! A
collection of photos of road and trail signs. Click
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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
Close-up
view of sign
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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