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β-tridymitehexagonal hP12, P63/mmc, No. 194[67]Closely related to α-tridymite; 'β-tridymite converts to β-cristobalite at 2010 K'Bold text''' ''' α-cristobalite tetragonal tP12, P41212, No. 92[68]2.334Metastable form under normal pressure

β-cristobalite cubic cF104, Fd3m, No.227[69]Closely related to α-cristobalite; melts at 1978 K

it is self-contradicted.