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Updated: June 5, 2025
This young scientist, too, cherished loving thoughts about Angelina, thoughts of a more earthly and volcanic tinge; certain definite projects which made him forget, at times, his preoccupation with biotite, perlite, magnetite, anorthite, and pyroxene. "Denis," said Keith, in his usual pompous fashion. "Do put down that absurd tray and let people help themselves. Listen to me for a moment.
Magnetite, indeed, must bulk more largely in the future as a source of iron, particularly because it is susceptible of magnetic separation, a process which as yet is only in its infancy.
Not only may ironstone containing magnetite be separated from other material, but several important minerals acquire the property of becoming magnetic when subjected to the operation of roasting, sometimes through a sulphide being converted into a magnetic oxide.
Would you like to be the responsible agent for the greatest exhibition of skill in a certain direction ever seen? Would you like to become the most famous impresario the world has ever known?" "Now," I said, forgetting my dignity under the enthusiasm with which I was inspired by my visitor's words, and infected more or less with his undoubtedly magnetite spirit "now you're shouting."
Many of the latter are magnetite, while the others are hornblende and various ferromagnesian silicates. I did not detect any fragments of volcanic origin. The specimen of argillaceous sandstone is made up of thin layers of fine-grained sand of the same sort as the first, alternating with others containing considerable clay.
2-Quartz Biotite Schist. Contact between above dike and amphibolite. A coarse black rock carrying magnetite and pyrites in considerable quantities. Under the microscope some of the biotite has a green coloration from decomposition and is surrounded by strong pleochroic halos. Small grains of secondary pyroxene are numerous. 3-Grand Lake.
What weight of magnetite must be taken for analysis in order that, after precipitating and igniting all the iron to Fe O , the percentage of Fe O in the sample may be found by multiplying the weight in grams of the ignited precipitate by 100? !Answer!: 0.9665 gram. If exactly 12.6 cc. of the mixture are required, how many grams of MgCl per liter does the solution contain?
This rude appliance was afterwards refined into the needle compass for guiding mariners on the sea, and assisting the professors of feng- shui or geomancy in their magic rites. Magnetite was also found at Heraclea in Lydia, and at Magnesium on the Meander or Magnesium at Sipylos, all in Asia Minor.
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