This beautiful slice is an example of eclogite, clearly showing the garnet inclusions. Quoting Wikipedia – ‘Eclogite typically results from high-pressure metamorphism of mafic igneous rock (typically basalt or gabbro) as it plunges into the mantle in a subduction zone’. I was asked by the Department of Earth Sciences at Oxford University, just up the road from me, to create a pendant based on the specimen as a gift for a leaving colleague. The Department has a logo of symbolic mountain ranges, so I decided to reflect that in the border.
The recipient was delighted!