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IV.—Note on New Minerals from West Phœnix Mine, and from St. Agnes
Published online by Cambridge University Press: 14 March 2018
Extract
The Mineral from West Phoenix occurs in globular masses of a Turquoise blue or bluish green color upon Limonite. The interior of each spherule is composed of Limonite within which is sometimes a minute quartz crystal; the exterior surface usually shews indistinct crystalline facets. Fragments examined with a hand-lens shew a conchoidal fracture, but a thin section exhibits faint indications of radiated and concentric structure.
The first specimen which came under my notice was given to me by Mr. Simmonds of Liskeard, in October 1875 as a variety of Chalcosiderite or Andrewsite. These minerals had recently been described by Professor N. S. Maskelyne and Dr. Flight, and as there is occasionally a certain resemblance between them and the new mineral, and they all occur together, it was supposed to be the same as one of them. As the specimen was small I placed it in my cabinet, being unwilling to destroy it by making an analysis.
- Type
- Research Article
- Information
- Mineralogical magazine and journal of the Mineralogical Society , Volume 1 , Issue 1 , August 1876 , pp. 11 - 15
- Copyright
- Copyright © The Mineralogical Society of Great Britain and Ireland 1876
References
page 11 note * The new mineral is often superficially coated with chalcosiderite.
page 12 note * Journal of the Chemical Society, July 1875.
page 14 note * Since reading the above papers Dr. Heddle has suggested that the “loss” may be due to zinc, fluorine, or boracic acid—neither of which would be detected by the mode of analysis adopted above. Having only .009 grams left for analysis I have carefully examined it before the blowpipe by the very delicate methods described in “Plattner,” but without finding the least trace of either. I have not been able to test for boracic acid from want of material, but I may say further that I am not aware of any test delicate enough to detect a small quantity of boracic acid iu the presence of a large quantity of phosphoric acid.
page 15 note * M. Pisanl analysed a Mineral of somewhat similar composition (Phil. Mag., Ap., 1868), and Dr. Flight two others (Journ. Chem. Soc, 187l, Jan.) The analyses are as follows :—where C is, Pisani’s mineral; A and B those of Dr. Flight; neither seem to have been named, but Pisani regarded his Mineral as a mixture of
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