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Tag: igneous

Posted on 28th April 20255th August 2025

The origins of our orbicular granite

Once a year, a peculiar, polished slab of rock is hauled down from its home on a windowsill near the 1A lab and propped up on the lawn against a row of knees for the annual Sedgwick Club photo. The slab, with its striking black and white circular patterns, has featured in most annual photos in the past 60 years.

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