Abstract

Pseudosinhalite, Mg2Al3O[BO4]2(OH), can, on chemical grounds, be regarded as a member of a polysomatic series consisting of two modules of the forsterite analogue sinhalite, MgAl[BO4], and one module of AlO(OH). However, in contrast to the isostructural polysomatic humite series with five members including forsterite, experiments suggest that there are no synthetic MgAl-analogues for the members norbergite, humite, and clinohumite.

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