 | | Journal (article/letter/editorial) | | ); Allan.Pring@flinders.edu.au (A.P.) Abstract: An extensive infrared (IR) spectroscopy study using...was undertaken to characterise opal-AG, opalAN (hyalite), opal-CT and opal-C, focussing on the Si-O fingerprint...spectroscopy shows that the three major IR bands of opal are split into transverse optical (TO) and longitudinal...rather than heterogeneity or particle size effects. An alternative use of ATR using unpowdered samples provides...non-destructive delineation of play of colour opals into opal-AG or opal-CT gems. We find that there are no special |  | | Journal (issue) | | of euclase have been recorded from New Zealand, USA (Sharp, 1961), Europe, Guyana, Sri Lanka (Deen, 1984)...crystals were sold in the 1930s to collections in the USA (Pough, 1991; see also Dirlam et al., 1992; McKie...pegmatite was mined for microlite and tantalite and was an important source of gem beryl, producing both aquamarine...pegmatites mined in south-west Uganda and at Kihandu mine, an unusual form of beryl with acute bipyramidal form...occur in the Grand Slam Beryl mine, phenakite in an unnamed beryl working and chrysoberyl in the Renda |  | | Journal (issue) | | check Dr. G. F. Claringbull kindly obtained for me an X-ray powder photograph from traces scraped from...do occur as intimate mixtures; and to obtain even an approximate estimate of the proportions in which...Robert Webster (!) carried out density measurements on an extensive range of green and pink jade-like grossulars...grossular. ( x 25). gemmological tests, that we have an almost complete range from nearly pure grossular...fluorescent and non-fluorescent grossulars might suggest an answer. I n the second place, the presence of the |  | | Book | | in Adamello Massif, Central Southern Alps, Italy: An Investigation of Its Mineralogy, Crystallography...and Allan Pring A Review of the Classification of Opal with Reference to Recent New Localities Reprinted...collaborative research projects worldwide. Ian Graham is also an Associate Editor of Mineralogical Magazine and the... is positioned between academia and industry. As an applied science, in gemology, the instruments used...Adamello massif, Italy. Tourmaline is considered as an important recorder of its geological formation [9 |  | | Journal (issue) | | six oxygens surrounding the iron in the geometry of an octahedron. Chromium 3 + produces the pattern shown...O5HgO] H ) ~ is blue because it contains copper as an essential constituent. Although other natural materials...be made to look like turquoise by the addition of an appropriate dye, it is easy to distinguish such materials...turquoise in addition to the X-ray amorphous component, an X-ray of the synthetic produces a turquoise pattern...surrounded by six oxygens arranged in the form of an octahedron. These three building blocks fit together |  | | Book | | specifics of SiO2 modifications and varieties (e.g., opal, chalcedony, agate, quartz, amethyst). Following...with varying crystallographic order exist which play an important role in geological as well as industrial...seifertite, high-pressure silica glass, moganite or opal, are relatively rare in extraterrestrial materials...phases and the development of specific properties is an important factor in geological research as well as...Springer Geology: Heidelberg, Germany; New York, NY, USA; Dordrecht, The Netherlands; London, UK, 2012; p |  | | Book | | specifics of SiO2 modifications and varieties (e.g., opal, chalcedony, agate, quartz, amethyst). Following...with varying crystallographic order exist which play an important role in geological as well as industrial...seifertite, high-pressure silica glass, moganite or opal, are relatively rare in extraterrestrial materials...phases and the development of specific properties is an important factor in geological research as well as...Springer Geology: Heidelberg, Germany; New York, NY, USA; Dordrecht, The Netherlands; London, UK, 2012; p |  | | Book (volume) | | Charing Cross Hospital. Pathologist to the London County Asylums. Fullerian Professor of Physiology at the...Association, 1887-1889. F. X. K. | Paralysis. j Ony*; [ Opal. Franz Xaver Kraus (1840-1901). Professor of Church...Formerly art-critic of the Saturday Review. Author of An Art Tour in the Northern Capitals of Europe; Schools...Historical Introduction to the Private Law of Rome, and of an edition i of the Institutes of Gaius and Rules of...D. f Professor of Mining and Metallurgy, Massachusetts Institute of Technology, Boston, -j President |
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