lamprophyre, Igneous rock, rich in alkalis, porphyritic, lots of mafic minerals both in phenocrysts and groundmass; alnoite is one type, a minette is another and in some instances such as Wawa diamond is found. <A HREF="http://www.spiderresources.com/news/July%2031%202000.htm" target="_new">http://www.spiderresources.com/news/July%2031%202000.htm</A> congratulations...