As always, the answer is 'it depends'. :)

Solid rock? Liquid rock? Gaseous rock? Plasma? :)

Wavelength?

A nice light rock like calcite it probably isn't too tough to measure.
Si02 is pretty easy too, I'm sure.

For classic basaltic or feldspathic rocks, I suspect you are going to
need something well outside the visible spectrum. At least in the
first two phases. Not to mention the issues in a non homogenous rock.

Bob the GeologyPhysics major.

On Fri, Sep 23, 2011 at 4:35 PM, Chris Howard <[email protected]> wrote:
> On 9/23/2011 3:23 PM, Brooke Clarke wrote:
>>
>> Hi again:
>>
>> What is the speed of light in rock?
>>
> Outside of a cave the answer is C.
> Inside a cave, it's too dark to read my watch.
>
> (With apologies to Grocho Marx)
>
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