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Gyrolite: Its Crystal Structure and Crystal Chemistry

Published online by Cambridge University Press:  05 July 2018

Stefano Merlino
Stefano Merlino*
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56100 Pisa, Italy
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Abstract

The crystal structure of gyrolite from Qarusait, Greenland, was solved and refined with the space group P and cell parameters a = 9.74(1), b = 9.74(1), c = 22.40(2)Å, α = 95.7(1)°, β = 91.5(1)°, γ = 120.0(1)°. The structure is built up by the stacking of the structural units already found in the crystal structure of reyerite (Merlino, 1972, 1988), namely tetrahedral sheets S1 and S2 and octahedral sheets O. The tetrahedral and octahedral sheets are connected by corner sharing to give rise to the complex layer which can be schematically described as 1OS2, where S2 and , as well as O and , are symmetry-related units. Successive complex layers with composition [Ca14Si23AlO60(OH)8]-5 are connected through an interlayer sheet made up by calcium and sodium cations and water molecules.

The unit cell content NaCa16Si23AlO60(OH)8·14H2O, determined by the structural study, was confirmed by a chemical analysis, apart from the indication of a somewhat larger water content. The crystal chemistry of gyrolite is discussed on the basis of the present structural results and the chemical data given in the literature for gyrolite from different localities: the crystal chemical formula which accounts for most gyrolite samples is Ca16Si24O60(OH)8·(14+x)H2O, with 0 ⩽ x ⩽ 3.

Stacking disorder, twinning and polytypic variants in gyrolite, as well as the structural relationships of gyrolite with truscottite, reyerite, fedorite and the synthetic phases K and Z are described and discussed.

Keywords

gyrolitecrystal structureQarusait, Greenland
Type
Mineralogy and Crystal Structures
Information
Mineralogical Magazine , Volume 52 , Issue 366 , June 1988 , pp. 377 - 387
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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