Hi I've been working, or trying to work a material I bought as "Alpine Jade" which I believe to be a green porphyry. (I'm working a block very appx 1mx0.25mx a depth varying from 25cm to about 12cm, like a cylinder flattened at one end) It's very very hard, has ruined a lot of tungsten. It has a kind of layered structure with inconvenient inclusions and streaks of calcite (?) Has anyone worked anything like this, or know what green porphyry looks like, where it comes from? Or could anyone help me to identify it? I'm not very good at reading matrices but I could have a go if someone prompted me. Thanks ............................................ For subscribe, unsubscribe, digest, archive and other options, consult our FAQ at http://www.learningstone.net/lslstfaq.html
