 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
 |
|
|||||||||||||||||||||
 |
 |
 |
 |
 |
 |
 |
 |
 |
|
|||||||||||||
 |
 |
 |
 |
 |
 |
|
||||||||||||||||
 |
 |
 |
 |
|
||||||||||||||||||
 |
 |
 |
 |
|
||||||||||||||||||
 |
 |
 |
|
|||||||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||||||||||||||||||
|
|
|
|
|
|
|
|
|
|
|||||||||||||
|
|
|
|
|
|
|
||||||||||||||||
|
|
|
|
|
||||||||||||||||||
|
|
|
|
|
||||||||||||||||||
|
|
|
|
|||||||||||||||||||
(Pb-Ca-Zn-Mg-silicate)
Mineral-A occurs associated with esperite, willemite, clinohedrite, hardystonite, and hodgkinsonite in a reaction zone wherein esperite replaces hardystonite from Franklin (Dunn, 1985b). Under the electron microprobe beam, Mineral-A has a very strong and diagnostic bright blue cathodoluminescence, similar to that of benitoite. Individual crystals are less than 5 microns; the size precluded a full characterization. Microprobe analysis yielded SiO2 27.3, MgO 5.9, CaO 14.0, MnO 0.9, ZnO 26.1, PbO 25.5, sum = 99.7 wt. %. Assuming Mg to be essential to this mineral, the composition approximates Pb4Zn5Ca4Mg2Si7O27.
 |
|
|||
|
|
||||
|
||||
| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
|
|||
|
|
|
|||
|
Link
to homepage
|
||||
|
This
page created: January 11, 2001 |
||||
|
|
|
|||
