 It has also been reported from the Aghbar mine in Ouarzazate Province, Morocco.Duke of Miranda do Corvo

The Dukes of Miranda do Corvo (in Portuguese "Duque de Miranda do Corvo") was a Portuguese title of nobility granted by Queen Maria I of Portugal, by a royal decree dated from May 13, 1796, to "Dom" José João Miguel de Bragança e Ligne, 1st Duke of Miranda do Corvo, who died in 1801, before his father, João Carlos de Bragança e Ligne de Sousa Tavares Mascarenhas da Silva, 2nd Duke of Lafões.The title of Duke of Miranda do Corvo (originally Count of Miranda do Corvo) was subsidiary to the title of Duke of Lafões, and was used by the House of Lafões heir during his father's life.