[Rockhounds] Blue Schist

[Wes Lingerfelt]

Pete,
I believe the California State Gem (Benitoite) is found in the Blueschist 
host rock of the Clear Creek BLM Management Area of Central California.
Cheers!
Wes
----- Original Message ----- 
From: <Pmodreski at aol.com>
To: <rockhounds at lists.drizzle.com>
Sent: Tuesday, July 17, 2007 7:22 AM
Subject: Re: [Rockhounds] Blue Schist


>
> Hi Larry,
>
> I'll give an answer.  Blueschist (it's usually written as one word) 
> actually
> refers to a particular kind of metamorphic rock, glaucophane  schist. 
> This
> contains the mineral glaucophane, which is actually kind of a 
> bluish-purple.
> It's found in areas such as coastal northern California--the  Franciscan
> Formation.  Someone who lives in the S.F. Bay area and  knows about local 
> geologic
> sites would probably know how to obtain a  specimen.
>
> It's not really noted for good crystals, just a somewhat unusual
> grayish-bluish-purplish rock that is of interest to geologists. 
> Glaucophane schist
> occurs in metamorphic rocks that form in a somewhat unusual  environment 
> of high
> pressures and relatively low temperatures; in zones of plate  collision 
> and
> subduction (e.g., California!).
>
> Pete Modreski
>
>
>
> In a message dated 7/17/2007 8:06:19 AM Mountain Daylight Time,
> larryrush at worldnet.att.net writes:
>
> List: I  received this from a student in Fla. I don't know of any "blue
> schist", the  only thing that comes to mind is possibly a finely divided 
> kyanite
> schist. Can  anyone help her?
>
> Larry Rush
>
>
>
>
>
>
>
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