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361 Views 2 Replies Last post: Apr 11, 2014 10:34 AM by Freddy Fieldmouse RSS
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Apr 9, 2014 11:05 AM

Green semi-transparent rock - id please

Found about 20 miles downstream of Kariba Dam on an island in the lower Zambezi.

 

It is semi transparent and hard enough to scratch glass. Grateful for expert opinions.

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    Apr 9, 2014 11:27 AM (in response to Freddy Fieldmouse)
    Re: Green semi-transparent rock - id please

    Depending on the hardness of the glass, it coule be quartz, topaz or corundum (incl. emerald)

    (the greenish colour is a bit reminiscent of apatite, but that is not hard enough).

    Quartz is most likely, and it appears to have been part of a vein. But the apparently amorphous structure is a bit of an issue (if it was a cryptocrystalline form of quartz such as chalcedony, I would expect it to be more opaque).

     

    I think investigtion under a microscope (as a thin section, in polarized light) could be necessary to get a reliable ID.

     

    Mike

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