I purchased this piece on my very first trip to Spain in 2017. It came from my reclusive friend Jose Luis Valdes who collected it years before and kept it locked away. He found the best pieces from the quarry after a bad injury and mining helped him to regain his mobility. This is one of the absolute finest exampled with isolated blue "beta" quartz on fibrous Magnesio-Riebeckite (asbestos) matrix.