Natural single crystals of barite obtained from Silver Band mines, Westmorland have been cleaved parallel to [001] and [110]. Interferometric examination has revealed that [110] cleavages are better than [001]. This may be due to the difference in binding energy between atoms in the same plane and atoms in the neighbouring plane. The cleavages have been etched in H 2 SO 4 and HCl; pit densities differ when etched in different acids. Matched pairs have been etched, one in H 2 SO 4 and its counterpart in HCl; one-to-one correspondence is not observed, contrary to what has been reported so far in other mineral crystals. If cleavages once etched in one etchant are re-etched in the other, correlation in the etch pattern is obtained. Implications are discussed.

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