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Minasgeraisite-(Y) discredited as an ordered intermediate between datolite and hingganite-(Y)
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Minasgeraisite-(Y) discredited as an ordered intermediate between datolite and hingganite-(Y)
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Journal Article
Minasgeraisite-(Y) discredited as an ordered intermediate between datolite and hingganite-(Y)
2023
Overview
Minasgeraisite-(Y) is discredited on the basis of it being an ordered intermediate between datolite and hingganite-(Y) (IMA-CNMNC Proposal 23-F). An idealised formula is (Ca2Y2)∎2(Be2B2)Si4O16(OH)4, which corresponds to Ca2∎B2Si2O8(OH)2 (datolite) + Y2∎Be2Si2O8(OH)2 (hingganite-(Y)). The type material is rich in Bi, the Bi-richest portion yet discovered from the type locality is shown to be an intermediate member between datolite, hingganite-(Y) and a hypothetical end-member phase yet to be found of composition Bi2∎Be2Si2O8(OH)2. Minasgeraisite-(Y) has a different space group to datolite and hingganite-(Y). This lowering of symmetry to an acentric triclinic system is caused by different element occupancies on the A site of the gadolinite supergroup structure, which for minasgeraisite-(Y) becomes four individual sites. Such an order-disorder of elements is not considered as species-defining criteria despite the change in space group. Therefore, minasgeraisite-(Y) is discredited.
