Abstract
Zoned bravoites from Mill Close Mine, Derbyshire and Maubach, Germany, have been examined to determine variations in color, reflectivity and microhardness in relation to compositional variations. In both localities nickel and cobalt showed a sympathetic relationship in the zones, which was antipathetic to iron. Iron-rich members were found to be harder and have higher reflectivity than those rich in cobalt and nickel, in the former case this could be correlated with cell-size variations. The analyses suggested variable amounts of nonstoichiometry and the reflectivity also decreased with increase in total metals.
| Original language | English |
|---|---|
| Pages (from-to) | 1075-1083 |
| Number of pages | 9 |
| Journal | American Mineralogist |
| Volume | 54 |
| Issue number | 7-8 |
| Publication status | Published - 1 Aug 1969 |