Stripy opal from Ethiopia Layers of precious opal are interleaved with the altered ignimbrite (volca
Stripy opal from Ethiopia Layers of precious opal are interleaved with the altered ignimbrite (volcanic deposits from pyroclastic flows) from which it formed in a layer now half way up a cliff made of strata of similar rocks, each recording a different eruptive episode. Loz Image credit: Robert Weldon -- source link
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