Interesting question. After the explosive eruption, the gas content of the rhyolitic magma should have decreased enough to allow obsidian to form. It is the right kind of lava. However, most of the lava dome in the Mount St. Helens caldera is dacite, which is "grainier" than obsidian, indicating that it cooled too slowly to have a "glassy" appearance. Obsidian flows must cool quickly to prevent crystal formation. It is possible that some obsidian was formed, but subsequently covered by dacite. I have not been able to find any reports that mention obsidian recovered from the Mount St Helens lava dome.
So the answer is a qualified no, we don't have any evidence of obsidian flows from Mount St Helens.
Incidentally, there are individuals and companies selling products they call "helenite" or "St Helens Obsidian", which is a synthetic material created by fusing volcanic ash (which may or may not have come from Mount St Helens).
Mount St Helens is violent.
what is the land around mt st helens used for
Mt St Helens is located in Skamania County, Washington State, USA.Elevation: 8365 ft
Mount St. Helens is located in the northern hemisphere, in the state of Washington in the United States.
yes
At Mt. St. Helens.
Mt. St. Helens Mt. St. Helens
Mt St Helens first erupted on May 18, 1980
Mt st. Helens is in Washington.
mt. st. helens is in the state of Washington
Mt. st. Helens is part of the High Cascade Range of mountains.
Mt St Helens is located in Skamania,County
Mount St Helens is violent.
Tacoma is approximately 50 miles from Mount Rainier and 75 miles from Mount St. Helens.
The 1980 eruption of Mount St. Helens.
Mount St. Helens is in Washington state,USA.
what is the land around mt st helens used for