A type of stone or mineral that contains furrow-like patterns or striations, or historically, a building stone with grooved surface.
Compound word from Old English 'furh' (furrow) and 'stan' (stone). This term likely emerged in building trades to describe stone with natural or worked grooves.
Ancient builders noticed that some stones naturally had lined patterns that looked like plowed fields, making them easier to split and stack—nature's hint about how to work with rock!
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