Abstract
Blue colour in sodic plagioclase is produced by electronic transitions of Pb in a manner similar to the mechanism causing colour in amazonite. The two blue feldspar varieties have the following characteristics in common: 1) elevated Pb concentrations (usually >0.01 wt.%), 2) structurally incorporated H+, 3) similar response of the colour to heating and irradiation and 4) similar band shape, position, and polarization in the optical spectrum.-J.A.Z.
| Original language | English |
|---|---|
| Pages (from-to) | 95-98 |
| Number of pages | 4 |
| Journal | American Mineralogist |
| Volume | 71 |
| Issue number | 1-2 |
| State | Published - 1986 |