New experiments were performed on small quartz crystals and cleavage fragments of sphalerite and calcite, none requiring sawing, grinding or polishing. Quartz samples were run at external water pressures of 2000 and 4000 bars, and temperatures from 100 degrees to 400 degrees C for up to 17 days. Internal pressures exceeded external by 2000-3000 bars in some runs. 'From this work and a review of the literature [authors] conclude that most inclusions have not suffered major leakage. Some previous experiments indicating leakage may be explained by microfractures introduced during sample preparation.' Leakage, by diffusion, of substances like hydrogen is not precluded.

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