The stones which they used were oblong, and pointed at each end, being made of a soft and unctuous soap-rock. From Wordnik.com. [A General History and Collection of Voyages and Travels — Volume 14] Reference
The soap-rock, which h is the property of fuller's earth in cleansing cloth, is found here; also alum ore, free-stone fit for building, and a grey-stone, in great demand for mill-stones, reckoned equal in. From Wordnik.com. [The geographical and historical dictionary of America and the West Indies : containing an entire translation of the Spanish work of Colonel Don Antonio de Alcedo...with large additions and compilations from modern voyages and travels, and from original and authentic information] Reference
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