Rashleighite, also called henwoodite, is a ferrian variety of turquoise. The names are in honour of the Cornish geologists Philip Rashleigh and William Jory Henwood.
References
Collins (1876) Mineralogical Magazine: 1: 11. Fairbanks (1942) The Mineralogist, Portland, Oregon: 10: 44 (as ferri-turquois). Foster (1876) Mineralogical Magazine: 1: 8. Ross (1876) Chem. News, October 13th. Ross (1876) Mineralogical Magazine: 1: 59. Russell (1948) Mineralogical Magazine: 28: 353. Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 947, 951.