The crystal structure of Mg end-member lizardite-1T forming polyhedral spheres from the Lizard, Cornwall

The crystal structure of lizardite-1 T from Gew-graze, Cornwall, has been refined by single-crystal X-ray diffraction to R 1 of 0.0263 and 0.0557, for two crystals having P 31 m space group and lattice parameters a = 5.2905(5) Å, c = 7.2815(8) Å, and a = 5.3111(10) Å, c = 7.2907(15) Å, respectively. The Gew-graze lizardite is very close to the end-member composition, so these refinements confirm the existence of well crystallized pure...