[Rockhounds] Blue Schist

[teresa jetter]

Hi Larry
could you tell me what the hardness of the Blueschist
usually is?  It seems from the reading that it can be
formed from a few different specimens.  Would it be
good or bad, for cutting cab's?
Thanks
Teri J
--- Pmodreski at aol.com wrote:

>  
> 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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