Notes on mineralogy. No. VII. On some rocks and minerals from central India : including two new species, hislopite and hunterite / by Samuel Haughton.

  • Haughton, Samuel.
Date:
[1859]
Catalogue details

Licence: Public Domain Mark

Credit: Notes on mineralogy. No. VII. On some rocks and minerals from central India : including two new species, hislopite and hunterite / by Samuel Haughton. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    1213 Alumina.... 91 Protoxide of iron . . 634 33 Magnesia . . . 245 . 1332 Number of atoms. Oxygen ratio. 1213 1 395 From the oxygen ratio here given, I deduce the following mineralogical formula for this remarkable mineral:— Ai?03}3Si03 + 3H0 • (I.) Or, Hydrated tersilicate of protoxide of iron. The following analysis by Rogers, of Glauconite from the green grains of the greensand formation of New Jersey, will serve to show the probable identity of Glauconite with the green siliceous skeleton of the green calc-spar of Nagpur :— Per-centage. Atoms. 53-26 1183 Alumina . 3-85 74 ^ Protoxide of iron . . 24-15 671 Magnesia . . 1-10 55 1-73 61 * 5-36 114 , 1-60 51. . 10-12 1124 101-17 1183 391 No formula has been proposed by Dana for Glauconite j but it is evident that the preceding analysis gives very exactly the formula (I.) found from Mr. Hislop's mineral. I propose to give the name of Hislopite to the remarkable combination of Calc-spar and Glauconite found by him at Nagpur: the two mi- nerals mutually penetrate each other, the calc-spar giving a form to the whole, and constitute together a beautiful example of the mineralogical law to which attention has been directed by M. Gages. No. 5. Doleritic lava, with amygdaloidal geodes and cavities, invariably lined with obsidian in a thin glazed pellicle, and occasionally filled up with tabular crystals of calc-spar. Lo- cality : Sitavalli Hill. Var. OL. Dolerite, partly amygdaloidal; cavities lined with green earth, and sometimes filled with calc-spar in flat crystals. Same locality.