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- W2016076374 abstract "Two samples of the material were sent by Dr. D. Morris, C.M.G., of the Imperial Agricultural Department for the West Indies, to Prof. Judd, who forwarded them to the Director of the Museum of Practical Geology. They consisted of a fine greyish-brown powder, not unlike ‘flour-emery,’ but somewhat coarser and distinctly gritty to the touch. This powder was passed through a set of sieves, and it was found that 69 per cent. passed a sieve of 90 meshes to the inch, and 95 per cent, passed one of 60 meshes. All passed 30 meshes to the inch. The 4 ‘ash’ contains plagioclase-felspar, hypersthene, monoclinic brownish augite, apatite, and magnetite, with fragments of a brown glass. The separated powders were all of much the same colour. Plagioclase-felspar is the most abundant constituent, mostly in broken fragments of very irregular shape. It belongs largely to labradorite, but appears to include more than one variety. Perfect crystals are not uncommon. Glass-enclosures are very numerous, and are frequently rectangular in outline: they often contain very small stationary bubbles. Many of the felspars have a thicker or thinner skin of glass adhering to their surfaces. This glass is brown, somewhat turbid, isotropic, with often many small rounded steam-cavities. The perfect crystals of felspar are often lozenge-shaped, as they lie on the broad flat brachypinacoid, being bounded by 001 and 201. Hypersthene is next in frequency. The larger crystals are strongly pleochroic in green and reddish-brown tints, as is usual in a volcanic hypersthene which is" @default.
- W2016076374 created "2016-06-24" @default.
- W2016076374 creator A5082420463 @default.
- W2016076374 date "1902-02-01" @default.
- W2016076374 modified "2023-09-26" @default.
- W2016076374 title "Note on a Preliminary Examination of the Ash that fell on Barbados after the Eruption at St. Vincent (West Indies)" @default.
- W2016076374 doi "https://doi.org/10.1144/gsl.jgs.1902.058.01-04.25" @default.
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