Schorl

from WordNet (r) 3.0 (2006)
schorl
    n 1: black tourmaline
    
from The Collaborative International Dictionary of English v.0.48
Schorl \Schorl\ (sh[^o]rl), n. [G. sch["o]rl; cf. Sw. sk["o]rl.]
   (Min.)
   Black tourmaline. [Written also {shorl}.]
   [1913 Webster]
    

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