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The Canadian Mineralogist; August 2009; v. 47; no. 4; p. 897-908; DOI: 10.3749/canmin.47.4.897
© 2009 Mineralogical Association of Canada
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Articles

MOSANDRITE: STRUCTURAL AND CRYSTAL-CHEMICAL RELATIONSHIPS WITH RINKITE

Marco Bellezza, Stefano Merlino§ and Natale Perchiazzi

Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, I–56126 Pisa, Italy

§ E-mail address: merlino{at}dst.unipi.it

Mosandrite, Ti({square},Ca,Na)3(Ca,REE)4(Si2O7)2[H2O,OH,F]4·~1 H2O, is a distinct mineral species in the rinkite group. Chemical (EPM data), TG–DSC studies and structural investigations indicate that mosandrite presents a particular chemical composition (low Ca, Na and F contents, high amount of H2O), unit-cell parameters (a 7.398, b 5.595, c 18.662 Å, β 101.37°, V 757.29 Å3; space-group symmetry P21/c; Z = 2), and a rinkite-type structure characterized by a low occupancy of the M(2) and M(3) sites.

Keywords: mosandrite, rinkite group, Låven Island, Norway.






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