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The high pressure structural evolution of a natural fluorapophyllite-(K) K 0.70 (NH 4 ) 0.20  Ca 3.97 Na 0.07 [Al 0.04 Si 7.96 O 20 ]F 0.99 ·(H 2 O) 8.05 ,  Z  = 2,  a  = 8.9757(2),  c  = 15.7920(2) Å, space group  P 4/ mnc , from Nidym river, East Siberia, Russia, compressed in penetrating (ethanol:water 4:1 mixture) and non-penetrating (paraffin oil) media up to 4.7 GPa, was studied by single-crystal X-ray diffraction with a diamond anvil cell. The compressibility is identical in both media. At the initial stage the compression proceeds mainly within the plane ( xy ) and less along the  z -axis; above 3 GPa the compression becomes almost isometric. Within the whole pressure range there are no signs of the symmetry lowering. The main pressure-induced effect on the tetrahedral layer consists in a cooperative rotation of the 4-fold rings, which provides the structure compression within the ( xy ) plane. The compression along the  z -axis proceeds through the shortening of the interlayer distance, whereas the thickness of silicate layer remains almost unchanged.

Structure evolution of fluorapophyllite-( K ) under high pressure