94 HOFFMANN S LIST OF 



coarse crystalline diorite occurring at the Fournier mine, iu the townsliip of South 

 Sherbrooke, Lanark county, iu the province of Ontario. Analyses, T. S. Hunt, Greol. 

 Can., 1863, p. 411: B. J. Harrington, Rep. Geol. Can., 1873-74, p. 198. 



187. Ontariolite. — A scapolite from the township of Galway, Peterborough county, 

 province of Ontario, has been called Ontariolite by C. U. Shepard (Am. Journ. Sci., 

 3 ser., vol. xx, p. .")4, 1880). [The value of an approximate analysis given, is 

 destroyed by the impurity of the material analyzed ; thus far it has no claim to ])e 

 considered an independent species — Dana, Min., App. iii, p. 106, 1882.] 



188. Opal — Common opal or semi-opal is mentioned, by Dr. How, as occurring at a few 

 localities iu the province of Nova Scotia. See also notes to " Cacholong," " Hyalite" 

 (under Addenda), "Tripolite." 



189. Orthoclase — This felspar is very abundant among the rocks of the Laurentian 

 system, and well-defined cleaA'able masses of a reddish, greyish-white or white color, 

 may be obtained in many localities, some of the most important (Laurentian) of which 

 are — the townships of North Burgess and Elmsley (Lanark Co.), Eoss, in large 

 crystals, and Sebastopol, also in A^ery large crystals (Renfrew Co.), in the province 

 of Ontario — Grenville and Chatham (Argenteuil Co.), and most of the townships of 

 Ottawa county. Also occurs in veins cutting altered slates iu the townships of 

 Leeds and Inverness (Megantic Co.), and Sutton (Brome Co.) ; and in the trachytes 

 of Chambly, Brome and Sheftbrd Mountains, and Mount Royal, province of Quebec. 

 Analyses, T. S. Hunt, Geol. Can., 1863, pp. 475,470: G. C. Hoffmann, Rep. Geol. 

 Can., 1876-77, pp. 511,512. 



190. Pargasite — Finely terminated crystals of dark green pargasite, sometimes an inch 

 in diameter, are foirnd implanted upon, or imbedded in, a greenish-white pyroxene, 



•at the High Falls and at the Ragged Chute, on the Madawaska in the township of 

 Blythfield, Renfrew county, province of Ontario. Anal., T. S. Hunt, Geol. Can., 1863, 

 p. 466. 



191. Pearl-spar^ — Is abundant, generally associated with calcite and gypsum, iu cavities 

 and géodes in the dolomites of the Niagara formation ; also, in association with calcite, 

 gypsum, barite and quartz, iu géodes in the dolomites of the Calciferous formation, 

 and is found in many of the metalliferous veins of Lake Superior and Lake Huron, 

 province of Ontario — and occasionally in those of the Eastern Townships of the 

 province of Quebec. 



192. Pectolite — Occurs in radiated fibrous aggregations, the fibres being an inch and a 

 ciuarter and less in length, at Cathcart (now McKellar's) Poiut, Thunder Bay, Lake 

 Superior, province of Ontario. 



193. Peristerite — The felspar described by Dr. Thompson under this name (in allusion 

 to its beau.tiful blueish opalescence) — a variety of albite, occurs in large cleavable 

 masses, with quartz, iu veins in the township of Bathurst (Lanark Co.), and in a vein 

 made up of a fine-grained mixture of reddish-white albite and quartz, enclosing large 

 cleavable masses of the opalescent albite, on the north shore of Stoney Lake, near the 

 mouth of Eel Creek, iu Burleigh (Peterborough Co.), province of Ontario. Analysis 

 of a specimen from first-named locality, T. S. Hunt, G-eol. Can., 1863, p. 477. 



194. Perthite — -The Perthite of Dr. Thompson (a flesh-red aventurine felspar, which, as 

 shown by Breithaupt, consists of interlaminated albite and orthoclase) occurs iu large 



