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lol I suppose it could be taken that way. Intrusive and Extrusive. Good catch there.

Pietermaritzburg. Ok, well it looks like you found the rock in the Natal Metamorphic Province then. That will help narrow down all of the possible rock types it could be and their composition. If...

Well, it looks like you have done your homework. Fantastic. It will be very interesting to see how the stone performs as a hone. The practical use is obviouly the ultimate test.

As for how I...

Did you happen to find the stone near the Port Shepstone, Valley of a Thousand Hills, Durban, region?

Great post and great stones!

I am a Geologist by trade and I can share the official name of that stone with you.

To my trained eye it looks like a phyllite schist. A phyllite shist is a fine...