13" x 2"
Gakkle Ridge lava shards from 85° N 85° E suspended in seaglass center framed by remagmized earth crust 23.5°N 45°W . . . . Costa Rican Accretionary Prism subduction zone colliding plates . . . . 635 million year old Namibian rock of "Snowball Earth"? And a randomly/perfectly-placed whoops! above the word "colliding".
Shiny rim and matte green back are glazes assembled from refined materials.