Roemerite is triclinic P1 with a 6.48, b 15.26, c 6.27 Aa, alpha 90 degrees 04', beta 100 degrees 48', gamma 85 degrees 28'. The orientation of the structural cell corresponds to Wolfe's normal setting based on the morphology. The cell contains 1[Fe''Fe 2 '''(SO 4 ) 4 .14H 2 O]. X-ray powder data and a list of associated minerals are included. The paper gives 2 tables for the reorientation of oblique cells to the normal setting.

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