whinstone


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]
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