Griffinite, Al2TiO5: A New Oxide Mineral from Inclusions in Corundum Xenocrysts from the Mount Carmel Area, Israel
Author:
Ma Chi1ORCID, Cámara Fernando2ORCID, Toledo Vered3, Bindi Luca4ORCID
Affiliation:
1. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA 2. Dipartimento di Scienze Della Terra “A. Desio”, Università Degli Studi di Milano, Via Mangiagalli 34, I-20133 Milan, Italy 3. Shefa Gems (A.T.M.) Ltd., Netanya 4210602, Israel 4. Dipartimento di Scienze Della Terra, Università Degli Studi di Firenze, Via La Pira 4, I-50121 Florence, Italy
Abstract
Griffinite (IMA 2021-110), ideally Al2TiO5, is a new mineral from inclusions in corundum xenocrysts from the Mount Carmel area, Israel. It occurs as subhedral crystals, ~1–4 μm in size, together with Zr-rich rutile within a corundum grain. In this study, a mean of eight electron probe microanalyses gave TiO2 44.41 (24), Al2O3 55.13 (18), FeO 0.47 (5), and MgO 0.37 (2), totaling 100.38 wt%, which corresponded, on the basis of a total of five oxygen atoms, to (Al1.97Mg0.02Fe0.01)Ti1.01O5. Electron back-scatter diffraction studies revealed that griffinite is orthorhombic and in the space group Cmcm, with a = 3.58 (2) Å, b = 9.44 (1) Å, c = 9.65 (1) Å, and V = 326 (2) Å3 with Z = 4. The six strongest calculated powder diffraction lines [d in Å (I/I0) (hkl)] are 3.347 (100) (110); 2.658 (90) (023); 4.720 (77) (020); 1.903 (57) (043); 1.790 (55) (200); and 1.688 (44) (134). In the crystal structure, Al3+ and Ti4+ are disordered into two distinct distorted octahedra, which form edge-sharing double chains. Griffinite is a high-temperature oxide mineral, formed in melt pockets in corundum-aggregate xenoliths derived from the upper mantle beneath Mount Carmel, Israel. The new mineral is named after William L. Griffin, a geologist at Macquarie University, Australia.
Funder
TEOREM deciphering geological processes using Terrestrial and Extraterrestrial ORE Mineral
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering
Reference37 articles.
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