i recieved stone beads that were the rock that was in a diamond mine in africa,
the rock they must break through to look for the diamonds,,what would
you call this rock?

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Request for Question Clarification by tutuzdad-ga on 25 Oct 2004 19:58 PDT

Much of the stone you are talking about is called "kimberlite", but
normally is had a tint to it that has been described by some people as
appearing rather dark greenish (but I suppose it might appear to be
black on some stones).

http://www.element51.com/kimberlite.jpg

http://www.eos.ubc.ca/~mkopylov/pubs/f6.jpeg

http://www.geolab.unc.edu/Petunia/IgMetAtlas/volcanic-micro/kimberlite.X.jpg


Does this answer your question?

tutuzdad-ga

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Request for Question Clarification by tutuzdad-ga on 25 Oct 2004 20:00 PDT

In fact, here is a piece that does look kind of "black and speckled":

http://www.diamondex.net/i/photos/caratphotos/CT001_0.jpg

tutuzdad-ga