Mineral Industries and Geology of Certain Areas - Vermont Agency ...

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70 REPORT OF THE VERMONT STATE GEOLOGIST. Waits River marble, Richardson quarry .......58.24 41 .76 58.26 41 .74 \Vashington variegated, Richardson quarry 6o. 15 39.85 6o. 145 39.855 Unicolor marble, Richardson quarrY .......55.49 44.51 55.50 44.50 Chelsea limestone, West Hill ................53.48 46.52 53.48 46.52 Tunbriclge limestone, North Village .......52.925 47.075 52.91 47.09 Vershire limestone, Ackernian Hill ...........53.28 46.72 53.27 46.73 Corinth limestone, Davis Hill ................55.005 44.995 55.00 45.00 Stratford limestone, Upper Village ..........52.94 47.06 52.89 47.11 Washington in a r b 1 e Warner Granite Co 55.32 44.68 55.325 44.675 From the above table it is evident that the Washington limestone presents a varied composition; that within a radius of 25 miles the carefully selected surface samples range in their percentage of solubility from 52.92 in Tunbridge to 6o.iS in WrashiIlgt olI; that the inciease of soluble carbonates is to the northward: and that the highest development of the marble is in the same direction on the crest of its great anticlinal. (c.) Analysis of Arsenopyrite from East Braintree, Vt. I 2 3 4 Per cent of arsemc .........43.58 43.03 43.24 43.72 lvralue of silver per ton ....... $i.00 $i .29 $i .6o $2.58 Theoretical per cent of arsenic 46.01 46.01 46.01 46.01 The mineral is arsenopyrite, commercially known as mispickel. It is therefore a suiph-arsenide of iron, carrying a little silver, $ REPORT OF THE VERMONT STATE GEOLOGIST. 71 and conforming very nearly to the formula FeAsS. The silver is present in too small quantity for profitable extraction of the precious metal save as a by-product. But the ore is so rich in arsenic and poor in silica that it ought to become an abundant source of a useful commodity which the American manufacturers are beginning to prepare. (d.) Analysis of Olivine in Liinbnrgite from Corinth, Vt. Si0 2 .................................40.35 40.35 FeO..................................9.288 9.297 MgO .................................50.318 50.321 Total .............................99.956 99.968 The formula (MgFe) 2SiO 4 may be given to the mineral. It is an orthosilicate in which the ratio of the magnesium is to the iron as : i. The theoretical percentage of this ratio varies but little from obtained results. Theoretical Si0 ................................ 41.0 FeO...............................9.8 MgO..............................49.2 (e.) 100.0 Anal vsis of Hexagonal Crystals of Phyllite, Set Transverse to the Foliation in the Washington Limestone. Stimmary of analyses: I 2 Si0 2 ...............................39.420 39.425 Ti0 2 ...............................245 .240 A120 ..............................22.140 22.145 FeO ...............................i8.o8i 18.08 CaO...............................510 .525
12 REPORT OF THE VERMONT STATE GEOLOGIST. REPORT OF THE VERMONT STATE GEOLOGIST. 73 MgO ..............................8.o88 8.103 (g.) 8.636 8.637 Analysis of a Selected Sample of Magnetic Iron from Bethel, Vt. 2 Iron protoxide ...............................28. 504 - .3 .3 Trace Equivalent to metallic iron ........... 22. I7O Trace Iron sesquioxide ................... 67.896 Equivalent to metallic iron ........... 99.781 47. 527 99.825 _________ Total metallic iron .............69.697 This mica corresponds very closely to the com plex orthosilicate biotite, for the third multiple of H Silica g angue , etc i 4SiO 4 , orthosilicic tcid, is H 1 Si 0 u ith 12 Al . 251 displaceable h drogen itom and the p Iollow ing substittition meets the demands of the problem Lime 028 Magnesia 263 H'K' Phosphoric acid ...............................014 Fe°Mg 1' Sf3012 Sulphur ......................................050 Al2v1 Water .......................................365 Titanium.......................................... (f.) Undetermined ................................ 656 Anal'sjs of Rliodonjte front Waits River. 100.000 - Si02 ................................. 45.27 45.28 The undetermined consists of carbonic acid and the oxides FeO ..................................8 . o8 8. io of sodium and potassium. MnO .................................46.33 46.42 The analysis proves the ore to be of high grade, equal to the famous Franconia ore in New Hampshire, Chateaugay, N. Y., 99.68 99 So or Dannemora, Sweden. It is fitted, therefore, for all uses of iron where tenacity and endurance are desired. The mineral is a metasilicate of manganese, with formula It occurs in a metamorphic chloritic schist. The schist is MnSiO 3 , in which a part of the manganese has been replaced soft and fragile, and can be easily worked. by ferrous iron. It is susceptible of a beautiful polish and well I have followed the deposits some distance northward and suited for all decorative and interior work. A considerable find the massive magnetite frequently exposed to view. One amount of valuable material has been destroyed by fracture mile north of the deposit it is reported observed upon the stirwhile prospecting for copper. Large pieces have been placed face. In the vicinity octahedral crystals of magnetite are frein the museum of Dartmouth College and in the National quently found; and black magnetic sand, generally gold hearing, Museum of Washington, D. C. lines many of the neighboring streams. The ore is ofttimes disseminated through the rock rather than concentrated into large veius. The evidence is in favor of a
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