(A) Turmalina Paraíba bruta e lapidada, onde é possível observar o hábito prismático e a coloração azul néon; (B) Turmalina Paraíba bruta com as estrias verticais destacadas. (Fonte: Shigley et al. 2001)
Marcel Mariën (29 April 1920 – 19 September 1993) was a Belgian surrealist (later Situationist), poet, essayist, photographer, collagist, and filmmaker.