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This Comment points out a number of errors in the recent paper by Zarechnaya,Dubrovinskaia, Dubrovinsky, et al. (Phys. Rev. Lett. 102, 185501 (2009)).Results and conclusions presented by Zarechnaya et al. (2009) are eitherincorrect or have been presented before.

Comment on "Superhard Semiconducting Optically Transparent High Pressure Phase of Boron"