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Updated: June 5, 2025
Under the microscope it is a confused mass of finely granulated minerals, with numerous included crystals. The rock has undergone complete metamorphism and its origin is unknown. 8 Phyllite-Near Otter Lake. A soft extremely fine grained gray rock, with a well developed schistose structure, carrying much magnetite, plagioclase, orthoclase and their alteration products.
This is different from the eastern part, where the latter are scarce. The principal product of the island is abaca, but rice is also raised and cocoanut oil is extracted. There are unworked mines of gold, magnetite, and sulphur. The capital is Tacloban, with a population of 5,226. It is situated 338 miles from Manila.
In the hand specimen it is an apparently pure orthoclase but in the thin section small scattered quartz grains are observed; as well as the alteration products, Kaolin and sericite. The minerals at contact are quartz, biotite, magnetite and hornblende. Both the quartz and orthoclase contain dust inclusions and crystallites, while the evidences of shearing and crushing are abundant.
Between these bands of orthoclase and the neighboring amphibolite are narrow bands of schist One hundred feet south of the above point is a second dike having a similar strike and dip and a width of eighteen feet. A third narrow dike, containing small pockets of magnetite, is twenty-five feet south of the second. Only the first is distinguished by the segregation of the quartz.
There are also numerous included crystals. The rock has been greatly crushed and sheared, and is much finer than No. 4. 6 Cap of Caribou Ridge. A hard compact rock of dark green color, having a mottled appearance, due to the presence of a white mineral. Pyroxene, quartz and augite form the groundmass, as seen in section. There are a few small grains of magnetite,
By mixing with an ore of this kind after it has been allowed to "weather" for a short time some finely-powdered magnetite the strongly hygroscopic constituents can be made practically magnetic, because the magnetic impalpable dust adheres to them, while it remains separate from the grains of the other minerals.
That native iron might have supplied the needs of many Philippine tribes, including the Tinguian, is certain, for important deposits of magnetite and hematite are found in Abra, in Ilocos Norte, Angat, Bulacan, Albay, and other parts of the Islands. On several occasions, when on the trail, the natives have called our attention to boulders, apparently of hematite, which they recognized as iron.
The quartz grains show secondary growth. 13 Altered Gabbro Thirty-two Miles Above Wuchusk Nipi on Nascaupee River. A coarse dark green rock whose principal constituents are pyroxene plagioclase and magnetite. There is a slightly developed diabasic structure and the rock is much altered by weathering; the resultant product being chlorite. 14 Quartizite Bibiquagin Lake.
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 process in detail consists in freeing the bath of melted pig-iron from excess of carbon by adding broken lumps of pure hematite or magnetite iron ore. This causes a violent boiling, which is kept up until the metal becomes soft enough, when it is allowed to stand to let the metal clear from the slag which floats in scum upon the top.
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