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Identity HelpEifel Micro Query

3rd May 2009 15:52 UTCJeffrey Shallit

At the Rochester Mineralogical Symposium I purchased a bunch of micros. Most I have no difficulty identifying the mineral in, but some are giving me problems. Here's the first one. Labeled as Dorrite, from Bellerberg, Eifel, Germany, I imagine the Dorrite is the carmine-red crystals in the photo. (Sorry about the quality; I am shooting with a hand-held digital camera through my microscope lens!). But there are also some columnar orange crystals that I can't identify. Any ideas?

3rd May 2009 16:31 UTCSaul Krotki Expert

You will probably find the red crystals in the mindat.org galleries as rhönite. We had quite a discussion about this a while back. My subtext now is corrected to read:


The minute crystals each measure 0.4 mm in length.


Robert Meyer Collection. Photomicrograph © Saul Krotki 2003.

3rd May 2009 16:37 UTCSaul Krotki Expert

The flat orange blades are amphiboles. Perhaps someone has more specific analysis information.

3rd May 2009 19:10 UTCSebastian Möller Expert

Hello,


Yes, the brownish red ones are most likely rhönite. The needles could be clinopyroxene (augite-diopside) or amphibole. You cannot tell the ID of the needles without analysis. Check out for black to deep red prismatic xls with metallic luster, which are pseudobrookite, and small hematite xls. Those are common in this association.


Regards,

Sebastian Möller
 
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