Webster's English Dictionary

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amphibole

am.phi.bole \'am(p)-f*-.bo-l\ n [F, fr. LL amphibolus, fr. Gk amphibolos 
   ambiguous fr. amphiball]ein to throw round, doubt, fr. amphi- + ballein to 
   throw - more at DEVIL 1: HORNBLENDE  2: any of a group of minerals 
   A2B5(Si,Al)8O22(OH)I2 with like crystal structures usu. containing three 
   groups of metal ions