Pirus (bahasa Inggris:turquoisecode: en is deprecated ) merupakan mineral tidak tembus cahaya berwarna toska yang dianggap sebagai batuan berharga karena warnanya yang unik.
Etimologi
Istilah "pirus" berasal dari kata bahasa Arab فيروز (fairuz).
Pogue, J. E. (1915). The turquoise: a study of its history, mineralogy, geology, ethnology, archaeology, mythology, folklore, and technology. National Academy of Sciences, The Rio Grande Press, Glorieta, New Mexico. ISBN 0-87380-056-7
Schadt, H. (1996). Goldsmith's art: 5000 years of jewelry and hollowware. Arnoldsche Art Publisher, Stuttgart, New York. ISBN 3-925369-54-6
Schumann, W. (2000). Gemstones of the world, revised edition. Sterling Publishing. ISBN 0-8069-9461-4
Webster, R. (2000). Gems: Their sources, descriptions and identification (5th ed.), pp.254–263. Butterworth-Heinemann, Great Britain. ISBN 0-7506-1674-1
