Abstract
An examination of synthetic crystalline material by single crystal X-ray diffractometry reveals a unit-cell dimension that was previously ascribed to tincalconite. However, the best fit to the reflection data obtained at 291(2) K is obtained with composition Na 6 [B 4 O 5 (OH) 4 )] 3 ·8H 2 O. This formula is different from the Na 2 [B 4 O 5 (OH) 4 )]·3H 2 O previously assigned to tincalconite from an earlier crystallographic study. Additionally, our model fits best with non-crystallographic measurements and agrees with the analysis from a more recent low temperature crystallographic analysis. Tincalconite is best formulated as Na 6 [B 4 O 5 (OH) 4 )] 3 ·8H 2 O. It is trigonal, R32, a = 11.1402 (11), c = 21.207 (3) Å, Z = 3, R = 0.020 for 512 F o > 4σ (F o ) and 0.021 for all 529 data at 291(2) K.
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