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A systematic crystal-chemical investigation of orthorhombic holmquistites has been done to deter­mine the reasons for their -  limited compositional variations. Structural constraints to the relative stability of  B Li amphiboles are also suggested by the occurrence of ferro- and feni-ferroclinoholmquistites, and the lack of clinohohnquistite. Detailed crystal-chemical analysis shows: (1) a remarkable constancy in composition, both in terms of charge arrangement and of limited homovalent  M1,3 (Mg -1 Fe 2+ ),  M2 (Al -1 Fe 3+ ), and  03 (OH -1 F) exchanges, (2) a remarkable constancy in the unit-cell dimensions, with the Fe 3+  content at the M2 site being the only factor affecting the b edge; (3) complete ordering of Li at the M4 site, in contrast with the common partitioning between the M4 and M3 sites in clinoamphiboles, which however couples with partial A-site occupancy; (4) complete ordering of bivalent cations at the M2 site; (5) an inverse relationship between the Fe 2+  and the Fe 3+  contents, which is interpreted as a way to keep the size of the octahedral strip constant; (6) a strong distortion of the octahedral sites, both in terms of angular variance and quadratic elongation.

american mineralogist

The crystal-chemistry of holmquistites: Ferroholmquistite from Greenbushes (Western Australia) and hints for compositional constraints in  B Li amphiboles