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The magnetite is somewhat decomposed, the resulting hematite filling the spaces between the quartz grains. 15 Anorthosite Shore of Lake Michikamau. A coarse grained rock of dark gray color, in which labradorite is the chief mineral. Magnetite and Kaolin are present in small quantities.
Labradorite, or lime- soda-feldspar, in which the proportions of lime and soda are the reverse to what they are in Oligoclase. 5. Anorthite or lime-feldspar. The two latter feldspars are rarely if ever found to enter into the composition of rocks containing quartz.
A short stop at Rigolette, to send about fifty letters ashore, a two days' delay in a cold, easterly storm at Turner Cove, on the south side of the inlet, when the icy winds, in contrast to the warm weather we had lately enjoyed, made us put on our heavy clothes and, even then, shiver a delay, however, that we did not grudge, for we were in a land of fish, game and labradorite this of a poor quality, as we afterward learned and where the doctor had more patients than he could easily attend to.
The result of this analysis is interesting, because both the ancient and modern lavas of Etna consist in like manner of augite, Labradorite, and titaniferous iron. An interesting discovery was made in 1867 by Mr. E.A. Wunsch in the carboniferous strata of the north-eastern part of the island of Arran.
The labradorite contains inclusions of rutile and biotite and has a well-developed wedge structure and cross fracture due to the pressure and shearing which it has undergone. It is also somewhat stained by the decomposition of the magnetite. On the map of the portage route to Lake Michikamau; that lake, the Grand River and Groswater Bay are taken from the map accompanying the report of Mr.
The waters were deep and black, the shores were steep and rocky, and some labradorite was seen. One small, curious island, evidently of iron, though we did not stop to examine it, took the form of a great head sticking above the water, with the tops of the shoulders visible. Sunday, September third, was a memorable day, a day that I shall never forget while I live.
The western side of the lake is studded with low islands, but its main body is unobstructed. The water is exceedingly clear, and is said by the Indians to have a great depth. The shores are rocky, sometimes formed of massive bed rock in which is found the beautifully colored labradorite; sometimes strewn with loose bowlders.
LABRADOR- ROCK is a term used for a compound of labradorite or labrador-feldspar and hypersthene; when the hypersthene predominates it is sometimes known under the name of HYPERSTHENE-ROCK. GABBRO and DIABASE are rocks mainly composed of triclinic feldspars and diallage.
FOREIGN. Ungulite or Obolus grit of Russia. BRITISH. Tremadoc slates. FOREIGN. "Primordial" zone of Bohemia in part, with trilobites of the genera Paradoxides, etc. BRITISH. Menevian beds of Wales, with Paradoxides Davidis, etc. FOREIGN. Lower portion of Barrande's "Primordial" zone in Bohemia. BRITISH. Fundamental gneiss of the Hebrides? FOREIGN. Labradorite series north of the river St.
Oddly enough during the operation the Eskimo, who was the only available person whom I had been able to find to hold the light, had fainted, and left me in darkness. I had previously had no idea that their sensibilities were so akin to ours. At Napatuliarasok Island are some lovely specimens of blue and green and golden Labradorite, a striated feldspar with a glorious sheen.
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