... oxide intergrowths together with Cr-spinel, rutile, and ilmenite. Yimengite-hawthorneite inclusions in enstatite contain (wt%) 3.72–8.04 BaO, 2.05–3.43 K 2 O, and 0.06–0.48 CaO. Their composition is transitional between yimengite and hawthorneite end-members with most grains exhibiting K-dominant...

...) 12 O 19 and barium ferrite (BaFe, 12 O 19 ). Typical electron-microbeam analyses of hawthorneite give TiO 2 = 22.2-23.6, Cr 2 O 3 = 33-34.9, FeO = 23.3-24.9, BaO = 12-13, and MgO = 2.9-3.5, with K 2 O, ZrO 2 , Al 2 O 3 , MnO, and Nb 2 O 5 in the range 0.1-0.5 (all wt%). A typical average composition...

...Table 3. Classification of the magnetoplumbite group. Magnetoplumbite subgroup, A  = Pb Magnetoplumbite Plumboferrite Nežilovite Hawthorneite subgroup, A  = Ba Hawthorneite Haggertyite Batiferrite Barioferrite Hibonite subgroup, A  = Ca Hibonite...

... titanate minerals on the basis of coexisting silicates and oxides vary from 70–100 km for hawthorneite [ 32 ] to 150 km for yimengite [ 29 ]. Haggerty et al. [ 33 ] determined that lindsleyite and mathiasite were stable in a narrow range of P = 20–30 kbar and T = 1000–1100 °C. Redox conditions...

..., but decreases rapidly in haggertyite. In this case, the relationship between spinel and haggertyite is identical to that described by Haggerty et al. (1989) between spinel and hawthorneite. Why this relationship is exceptional, and why small spinel and larger haggertyite are commonly observed to coexist...

... , G. (1994) High pressure synthesis of priderites and members of lindsleyite-mathiasite and hawthorneite-yimengite series . Contrib. Mineral. Petrol , v. 117 , pp. 164 – 174 . Fox , C.S. (1930) Jharia Coalfield , Mem. Geol. Surv. India , v. 56 , pp. 255 – 255 . Gaspar...

... classified in the hawthorneite subgroup where A = Ba, the large cation site in the magnetoplumbite (A = Pb) structure ( Holtstam and Hålenius, 2020 ). It was first described from the Prairie Creek lamproite, Arkansas, U.S.A. ( Mitchell and Bergman 1991 and references therein), where it occurs exclusively...

.... , Grey , I.E. , Madsen , I.C. , Criddle , A.J. , and Erlank , A.J. ( 1989 ) Hawthorneite, Ba[Ti 3 Cr 4 Fe 4 Mg]O 19 : A new metasomatic magnetoplumbite-type mineral from the upper mantle . American Mineralogist , 74 , 668 – 675 . Hazen , R.M. and Navrotsky , A. ( 1996...

... 12 O 19 . The group is divided into subgroups, based on the dominant A cation: magnetoplumbite subgroup ( A  = Pb), hawthorneite subgroup ( A  = Ba), and hibonite subgroup ( A  = Ca). Hibonite-(Fe) has been renamed to chihuahuaite. Walentaite group The walentaite group has been...

..., (As,Sb) 2 (Ti,V,Fe,Al) 12 O 23 OH, a new mineral species from the Hemlo gold deposit, Hemlo, Ontario, and its crystal structure. Canadian Mineralogist , 27 , 427 –440. Haggerty, S.E., Grey, I.E., Madsen, I.C., Criddle, A.J . and Stanley, C.J. ( 1989 ) Hawthorneite, Ba(Ti 3 Cr 4 Fe 4 Mg) 19...

... , 1531 – 1534 . Foley , S. , Höfer , H. and Brey , G. ( 1994 ) High-pressure synthesis of priderite and members of the lindleyite-mathiasite and hawthorneite-yimengite series . Contributions to Mineralogy and Petrology , 117 , 164 – 174 . Gaspar , J.C. , Conceição e...

...-pressure synthesis of priderite and members of the lindsleyite–mathiasite and hawthorneite–yimengite series . Contrib. Mineral. Petrol . 117 , 164 – 174 . Gaspar , J.C. , Conceicao e Silva , A.J.G. & De Araujo , D.P. ( 1994 ): Composition of priderite in phlogopitites from...

...) and suggested it had formed during a K-metasomatic event that overprinted the chemistry of the ambient mantle. They also suggested it might be linked to other alkali titanates (i.e., crichtonite-armalcolite, rutile, ilmenite, hawthorneite-yimengite) developed in metasomatic rocks erupted by kimberlites from 70...