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Thorikosite for study

Posted by Natale Perchiazzi  
Natale Perchiazzi September 14, 2018 10:13AM
Dear All,
I am looking for thorikosite crystals suitable for X-ray single crystal structural study. Good features are transparent clear individuals with dimensions greater than 0.1 mm. Your help is greatly appreciated!
best withes Natale Perchiazzi

Earth Science Department
Pisa University, Italy
Uwe Kolitsch September 14, 2018 12:12PM
Hi Natale,
I have an unpublished structure refinement of thorikosite (in I4/mmm, R = 4.4%), that strongly suggests that the structure is only pseudotetragonal (+ additional twinning?); unrestrained unit-cell parameters are: 3.90878 3.92637 12.89082 90.032 89.996 89.997. I never tried other space-group symmetries, though.
The flattened crystal morphology also seems to contradict tetragonal symmetry.
Feel free to contact me by email for more details.

Ciao, Uwe
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