 | | Report (issue) | | Crystals short prismatic, to 0.5 mm, dominated by f101g and pinacoids k to [001]. Twinning: Not uncommon, with...Physical Properties: Cleavage: Distinct on f101g and f010g, indistinct on f100g. Tenacity: Brittle. Hardness...912(2) ® = 106± 14(2)0 X-ray Powder Pattern: Ascension Island. 4.20 (vs), 3.58 (vs), 3.08 (vs), 5.90 (s)...02 0.11 0.04 15.60 0.04 100.91 99.94 (1) Ascension Island; corresponds to (K1:79 Na0:32 )§=2:11 Zr1:01...of alkalic granite in trachytic and basaltic tu®s (Ascension Island); in syenite (Serra de Agua de Pau |  | Jeffery, A. J., Gertisser, R., Jackson, R. A., O'Driscoll, B., Kronz, A. (2016) On the compositional variability of dalyite, K2ZrSi6O15: a new occurrence from Terceira, Azores. Mineralogical Magazine, 80 (4) 547-565 doi:10.1180/minmag.2016.080.018 | Journal (article/letter/editorial) | | JACKSON1, B. O’DRISCOLL1,2 AND A. KRONZ3 1 2 3 School of Physical and Geographical Sciences, Keele...Staffordshire ST5 5BG, UK School of Earth, Atmospheric and Environmental Sciences, The University of Manchester...the placement of substituting Hf and Ti in the octahedral site, and highlight the overall complexity...Fe, Mg and Ba. The combined dataset reveals that dalyite found within peralkaline granites and syenites...is generally defined by higher Na↔K substitution and lower Ti↔Zr substitution relative to dalyite from |  | | Journal (article/letter/editorial) | | dalyite By S. G. FLEET Department of Mineralogy and Petrology, With (Received University of Cambridge...silicate K1.7oNao.30ZrSi6015' has been determined and refined by two-dimensional Fourier methods, It is... six- and eight-membered rings of Si04 tetrahedra, The sheets are joined by Zr06 octahedra and by (K...distances range from 1.54 A to 1.67 A (::I:: ,01 A) and the average of twelve independent Si-O distances...(::I:: .03 A), and the average K(Na)-O distance 3.02 A (::I:: .13 A). 1. Introduction and summary of |  | | Journal (article/letter/editorial) | | dalyite By S. G. FLEET Department of Mineralogy and Petrology, With (Received University of Cambridge...silicate K1.7oNao.30ZrSi6015' has been determined and refined by two-dimensional Fourier methods, It is... six- and eight-membered rings of Si04 tetrahedra, The sheets are joined by Zr06 octahedra and by (K...distances range from 1.54 A to 1.67 A (::I:: ,01 A) and the average of twelve independent Si-O distances...(::I:: .03 A), and the average K(Na)-O distance 3.02 A (::I:: .13 A). 1. Introduction and summary of |  | | Book (edition) | | admiration and affection that I dedicate this edition to my co-author, teacher, mentor, colleague and friend...Glossaryof MINERAL SPECIES 2008 Malcolm E. Back and Joseph A. Mandarino The Mineralogical RecordIne...as of December I, 2007. of the names, symmetry. and chemical compositionsof mineralspecies.Synonymsand...sadness. On September 18, 2007, my Teacher, Mentor and Friend. Joe Mandarino passed away after a long battle...including the International Encyclopedia of Minerals and the next edition of the Glossary, Joe asked me if |
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