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Elliottite
A valid IMA mineral species
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![NaMgAl3(PO4)2F6 · 9H2O](#"/photo-1260340.html"><img src="/image.pl?url=https%3a%2f%2fwww.mindat.org%2fimagecache%2f7e%2f05%2f08164040017272473563105.jpg&f=jpg&w=240" alt="08164040017272473563105.jpg" /></a><div><b>Peter Elliott and John Toma</b></div></div></div><div><div><span>Formula:</span><div class=){kind=link}
Colour:
Colorless. White in aggregates.
Specific Gravity:
2.09 (Calculated)
Crystal System:
Monoclinic
Name:
The name is for Peter Elliott (born 1954) in recognition of his significant contributions to the characterization and naming of more than 30 new minerals from Australian localities (half of which he personally collected) and in particular his major contributions to the descriptions of new phosphate minerals from South Australian deposits. These include airdite, bimbowrieite, penriceite, plumboperloffite, puttapaite, reaphookhillite, whiteite-(MnMnMg) and whiterockite. He is also first author on a review of the phosphate deposits of South Australia (Elliott et al., 2013).
Dimorph of:
Closely related, both compositionally and structurally, totomsquarryite (OH-dominant).
Represents a new type ofcrandallite-derivative layered structure. Topology of Al-centred corner-sharing octahedra and phosphate tetrahedra fits that in crandallite, but the layer separation is expanded in response to location of Mg2(H2O)10 edge-shared octahedral dimers and H2O molecules within the interlayer. The structure related penriceite is formed via periodic unit-cell-scale twinning of the structure of elliottite.
Represents a new type ofcrandallite-derivative layered structure. Topology of Al-centred corner-sharing octahedra and phosphate tetrahedra fits that in crandallite, but the layer separation is expanded in response to location of Mg2(H2O)10 edge-shared octahedral dimers and H2O molecules within the interlayer. The structure related penriceite is formed via periodic unit-cell-scale twinning of the structure of elliottite.