Rashleighite, also called henwoodite, is a ferrian variety of

turquoise Turquoise is an opaque, blue-to-green mineral that is a hydrated phosphate of copper and aluminium, with the chemical formula . It is rare and valuable in finer grades and has been prized as a gemstone and ornamental stone for thousands of year ...

. 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. Phosphate minerals {{phosphate-mineral-stub