[Rockhounds] Garnet & Kyanite

[John Siebel]

Freezeout Mountain, Shoshone County, Idaho sports both kyanite and garnet in 
mica schist. There is staurolite nearby. Lanny could certainly elaborate on 
this as his field guides got us up there.

John

----- Original Message ----- 
From: "Carolyn Reynard"
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