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From The Collaborative International Dictionary of English v.0.48:
Whinstone \Whin"stone"\, n. [Whin + stone; cf. Scot. quhynstane.] A provincial name given in England to basaltic rocks, and applied by miners to other kind of dark-colored unstratified rocks which resist the point of the pick. -- for example, to masses of chert. Whin-dikes, and whin-sills, are names sometimes given to veins or beds of basalt. [1913 Webster]