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Clinozoisite... what it is and how was it formed?
  
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RockHunter




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PostPosted: Dec 14, 2019 06:13    Post subject: Clinozoisite... what it is and how was it formed?  

I googled clinozoisite and mostly came up with chemical formula name etc... I am more interested in how was it formed?

What condition(s), what kind of environment is needed in order to develop clinozoisite?

I got the gist that clinozoisite exists in a regional/contact metamorphic with high calcium content?
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Roger Warin




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PostPosted: Dec 14, 2019 09:06    Post subject: Re: Clinozoisite... what it is and how was it formed?  

Clinozoisite.
Plagioclases alter in two ways: The alteration of acidic plagioclases is sericitization: the crystal is covered with a felting of small flakes of sericite (microcrystalline muscovite).
The altered plagioclases then take on a porcelain or slightly greenish tint.

The alteration of basic plagioclases formed at higher temperatures is more complex: it is saussuritization, obtaining a mixture of albite and epidote. In the epidote, the replacement of Fe3 + by Al3 + induces the continuous formation (solid solution) of clinozoisite while the substitution by Mn3 + gives piemontite.

The training conditions are very varied and they correspond to the metamorphism of green shales.
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RockHunter




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PostPosted: Dec 16, 2019 03:52    Post subject: Re: Clinozoisite... what it is and how was it formed?  

Thank you, Roger for your insight.
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