The problem of the quartz dolerites: Some significant facts concerning mineral volume grain size and fabric. Appendix: The variation of density and magnetic properties

The problem of the quartz dolerites has been attacked by a number of methods, yet much remains to be discovered regarding the differentiation of these rocks. Chemical methods and mineralogical studies, particularly with regard to the pyroxenes, have thrown much light upon the problem, but the extreme uniformity of the dolerites still remains unexplained, and makes the matter of attack on their genesis difficult