[Rockhounds] Garnet & Kyanite

[Carolyn Reynard]

found in mica shist.


----- Original Message ----- 
From: "Carolyn Reynard" <sunstone3 at hvc.rr.com>
To: "Rockhounds" <Rockhounds at lists.drizzle.com>
Sent: Monday, November 05, 2007 7:32 PM
Subject: [Rockhounds] Garnet & Kyanite


Jim,

Kyanite forms at a higher pressure and temperature than garnet, so usually
they are not together. There are exceptions I have a specimen from Russia
that has both. I believe that would indicate my Russian specimen is right on
the boundary ( isograd) between the two. (adjacent metamorphic zones on a
map are separated by isograds or line of equal grade.)

 Not sure about the alteration of kyanite to mica, but I do know cordierite
alters to mica, so there is a good possibility. Kyanite is often found  mica
schist.

Carolyn Reynard



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