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The effect of pressure on the helvite structure has been studied up to 45 kbar, using the single-crystal diffraction technique. The result has shown that an abrupt shrinkage of the BeO 4  tetrahedra takes place at around 30 kbar, thus showing that the compression of the helvite framework is not a simple function of the rotation of the tetrahedra. At around that pressure, the BeO 4  tetrahedra contracted by about 3.2%, while SiO 4  seems to show a slight expansion by about 1.4%

The effect of pressure on helvite Mn 8 S 2 [Be 6 Si 6 O 24 ]