Sample extremely sensitive to hand-pressure,
leading to an extraordinary preferred orientation effect.
Pressing the sample on a glass slide :
Dusting the sample through a sieve :
Identification is positive by a default search in the PDF-2 database :
Zeropoint evaluated by the harmonics method,
refining fictitious cell parameters.
TREOR90 tests in monoclinic symmetry allow to obtain a proposition after having increased the maximum cell volume successively to 200, 400, 600, 800, 1000 and finally 1200 A3.
ITO does not provide the same cell.
DICVOL91 gives the same result
Ultimate verification of the cell quality.
The P21/c space group is suggested.