Slate

From International Dictionary of Marine Aids to Navigation
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urn:mrn:iala:dic:7-3-0140

A roofing material which is obtained by quarrying a metamorphic stratified rock of the same name. The quarried blocks may be cleaved along the joint planes into individual slates of a desired thickness.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)