Raman seems a fine test, but SEM/probe-EDS easily would distinguish between Rt, Ttn, and Ilm. I do not see a scale bar on the images, but you should be able to get the excitation to ~1 um @10 kV. However, the apparent non-opacity would preclude Ilm.
At 04:21 PM 12/8/2011, Andreas Möller wrote:
I agree that it should be vaidated by Raman, but
titanite is not likely in this case because the=20
rock composition of Grt-Pl-Bt-Qtz-Sill=20
(metasediment?) is probably low-Ca.
The only other viable candidate is ilmenite.
At 10:14 PM +0100 12/8/11, Francois Guillot wrote:
I would not say no to rutile but... Raman testing of similar-looking needles gave me titanite, once.
Let's wait for the test.