Atomizer Geyser, Cone geyser in Upper Geyser Basin, Yellowstone National Park, US

Atomizer Geyser is a cone geyser in the Upper Geyser Basin of Yellowstone National Park, formed by two cones about 1 m tall. The left cone is the jetting cone from which all water jets come; the right cone sprays a fine mist during major eruptions, giving the geyser its name.

The geyser was named after the atomizing effect of its water spray, which resembles the function of early perfume dispensers. This name captures the distinctive appearance of how the water disperses.

The name comes from the fine mist thrown from the second cone during major eruptions, compared to the spray of an atomizer. The Cascade Group, which Atomizer shares with Artemisia Geyser, takes its name from the nearby Cascade Geyser. Visitors watch the two cones from the boardwalk and time the series of minor eruptions before the major one.

Atomizer sits in the Cascade Group of the Upper Geyser Basin, reached by the boardwalk from the Old Faithful area. Watch for the pool overflowing every few minutes for two to four hours before the first minor eruption. Minor eruptions come about an hour apart, and the major one follows 15 minutes to 1½ hours after the last minor. After a major eruption the pool needs about six hours to refill.

The two cones stand about 1 m tall, and only the jetting cone throws water; the second cone releases the fine mist that gave the geyser its name. After a major eruption the pool needs roughly six hours to refill before the overflow cycle starts again.