 |
 |
What about orthopyroxene with Xfe > 40, if it has a pleochroism to green? It would be useful if you can give us more optical details. Francois Am 2 Nov 2007 um 14:01 schrieb Gerrit de Kock: > > ----- Original Message ----- > From: Gerrit de Kock > > Sent: Friday, November 02, 2007 2:58 PM > Subject: mineral id > > I have the gabbros from the Eburnean from Ghana(~2120Ma old). They > are not tectonized but suffered severe hydration and then low grade > metamorphism producing epidote and sphene. In places cpx and > plagioclase are still preserved as well as an orange mineral. > Anyone with an idea of what the orange mineral can be. It is > unlikely to be primary olivine. > > Gerrit de Kock > Council for Geoscience > South Africa > [log in to unmask] > ----- Original Message ----- > > Disclaimer Legal Notice: > By having opened and read this electronic mail, you are deemed to > have understood and accepted all disclaimers and conditions > pertaining to electronic mail emanating from, and received by The > Council for Geoscience, further detail of which may be viewed by > clicking here: > Disclaimer > <gd4209 mmanta pxn subophytic plag cpx texture.alt olivine pyrite > late.JPG> > <ga1099 mmanta pxn cpx plag ol alt pyrite.JPG> > <ga1099 mmantapxn cpx plag subophytic rutile, ol pyrite idiomorphic > xnic.JPG>