What does «vitriolo» mean in Spanish?

An old name for a wide variety of crystallized metallic sulfates, similar to colored glass (hence the name).
(vitriolo amoniacal) Ammonia sulfate.
(vitriolo azul) Copper sulfate, also called Cyprus vitriol.
(vitriolo blanco) Zinc sulfate.
(vitriolo de luna) Silver sulfate.
(vitriolo de Marte) Iron sulfate.
(vitriolo de plomo) Anglesite.
(vitriolo verde) Caparrosa green.
(espíritu de vitriolo) Vitriolic acid, also known as sulfuric acid.