A Glass Menagerie
Posted by: Groundspeak Premium Member Volcanoguy
N 43° 42.311 W 121° 14.126
10T E 642172 N 4840641
Sign at the bottom of the stairway on the Big Obsidian Flow Trail.
Waymark Code: WM418E
Location: Oregon, United States
Date Posted: 06/22/2008
Published By:Groundspeak Premium Member TheBeanTeam
Views: 15

This sign is located at the bottom of the stairway on the Big Obsidian Flow Trail.

Marker Name: A Glass Menagerie
Marker Text: Why is everything glass? Whether natural or synthetic, the primary ingredient in glass is silica (silicon dioxide). The obsidian and pumice of this lava flow contain about 73% silica, like most window glass does. In a hot, molten state, silica’s atoms tend to stick together and create webs of molecules that slow down the movement of all atoms. The surface of this lava flow cooled off before its atoms had time to organize into crystals, so we are left with glass instead.
The entire surface of this remarkable flow is glass, a liquid that cooled without crystallizing. The striking differences you see from rock to rock are due to the number and size of bubbles.

Historic Topic: Geological

Group Responsible for placement: Forest Service

Marker Type: Trail

Region: Central Oregon

County: Deschutes

State of Oregon Historical Marker "Beaver Board": Not listed

Web link to additional information: Not listed

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mspgenealogy visited A Glass Menagerie 07/31/2014 mspgenealogy visited it
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