Bulletin - United States Geological Survey
Bulletin - United States Geological Survey
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It has exactly the form of the biotite which it replaces. In the partly decomposed biotite there are alternating streaks of chlorite and biotite lying parallel to the cleavage. Epidote is in some speci- mens abundantly associated with chlorite, being also an alteration product of biotite. The biotite contains abimdant inclusions of apatite, and some specimens contain titanite.
Amphibole is present in nearly all of the quartz monzonites. The most common form is green hornblende, which is associa...ted with the biotite, either in greater or equal amounts, or, most generally, in subordinate amounts, or locally it is absent altogether. It is pleo- chroic and varies in color from light green to olive green or dark bluish green. It is generally fresh but is locally altered to fibrous colorless amphibole, chlorite, epidote, quartz, and carbonates.
In several specimens a colorless amphibole was observed both as compact crystals and as fibrous aggregates, the latter plainly second- ary after green hornblende, with recrystaUization.
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You can find similar books in the "Read Also" column, or choose other free books by Geological Survey (U .S.), Geological Survey (U.S. to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
It has exactly the form of the biotite which it replaces. In the partly decomposed biotite there are alternating streaks of chlorite and biotite lying parallel to the cleavage. Epidote is in some speci- mens abundantly associated with chlorite, being also an alteration product of biotite. The biotite contains abimdant inclusions of apatite, and some specimens contain titanite.
Amphibole is present in nearly all of the quartz monzonites. The most common form is green hornblende, which is associa...ted with the biotite, either in greater or equal amounts, or, most generally, in subordinate amounts, or locally it is absent altogether. It is pleo- chroic and varies in color from light green to olive green or dark bluish green. It is generally fresh but is locally altered to fibrous colorless amphibole, chlorite, epidote, quartz, and carbonates.
In several specimens a colorless amphibole was observed both as compact crystals and as fibrous aggregates, the latter plainly second- ary after green hornblende, with recrystaUization.
What to read after Bulletin - United States Geological Survey?
You can find similar books in the "Read Also" column, or choose other free books by Geological Survey (U .S.), Geological Survey (U.S. to read onlineMoreLess
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