Amphiboles: Crystal Chemistry, Occurrence, And ... -
Unlike many other rock-forming minerals, amphiboles contain water (in the form of OH−cap O cap H raised to the negative power
). This makes them "hydrous" minerals, which is a key indicator of the environment in which they formed. 2. Occurrence: Where Do They Live? Amphiboles: Crystal Chemistry, Occurrence, and ...
Certain types, like pargasite, can even exist deep in the Earth's upper mantle, acting as a crucial storage unit for water in the deep crust. 3. Why They Matter Occurrence: Where Do They Live
They are primary minerals in intermediate to felsic rocks. If you see dark, needle-like crystals in diorite , andesite , or granite , you’re likely looking at Hornblende—the most common amphibole. Why They Matter They are primary minerals in
Because their chemistry changes based on temperature and pressure, they help geologists "read" the history of a mountain range or a volcanic eruption.
Understanding amphiboles isn't just an academic exercise. They are vital for several reasons:
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