… monumental or building stone of an apparent specific gravity of 2.5 or more, and alabaster, whether or not …
Explanatory notes
… monumental or building stone of an apparent specific gravity of 2.5 or more, and alabaster, whether or not … They have uneven, broken surfaces and irregular edges. This type of stone often bears the marks of quarrying (blast … superfluous protuberances by means of hammer or chisel‑type tools. This subheading does not cover blocks or slabs …