Petrographic Methods the Authorized English Translation of Part I Anleitung Zu
Petrographic Methods the Authorized English Translation of Part I Anleitung Zu
Zed20english20translation20of20part20i2c20a
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Fine grained to scaly aggregates of brown iron hydroxides with brilliant interference colors are widely observed as pseudomorphs after pyrite. It cannot be positively determined whether they belong to goethite or not. The same is true for brown iron ore limonite 2Fe 2 O 3 . 3H 2 O, which under certain conditions forms similar aggregates. It is fibrous with perfect cleavage in the direction of the fibers and has a positive principal zone and negative double refraction. It has high indices. F~ a:... = 0. 05. 2V is very large. It is brown to yellow pleochroic fc> c> 0. DESCRIPTIVE SECTION 255 Pseudobrookite (7) Small rectangular tabular crystals of pseudobrookite are but rarely found in the recent eruptive rocks and their tuffs. It is quite similar to brookite, but is usually deeper colored and is probably always secondary, formed by fumaroles. It is red, transparent under the microscope only when it is extremely thin and is weakly pleochroic. It is distinguished from brookite, goethite and wurtzite, which appear quite similar to it in ordinary light, by the depth of color and observations in convergent light.
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