| References: | 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: 280; Specimen in the Natural History Museum, London.; Ford, T., A. Sarjeant & M. Smith (1993) The minerals of the Peak district of Derbyshire UK Jour. Mines & Minerals 13:16-55 |