Polymorphs are crystalline substances composed of the same element but with different atomic configurations and thus very different physical properties. Dr. H. Tracy Hall, the first scientist to successfully produce diamonds from graphite, explains how pressure and heat can be applied, either individually or combined, to a substance to produce a new polymorphous substance. This process has resulted in the commercial diamond business and may in the future yield other profitable and beneficial industries and products.
Hall, H. Tracy
"Polymorphism and High Pressure,"
BYU Studies Quarterly: Vol. 5
, Article 3.
Available at: http://scholarsarchive.byu.edu/byusq/vol5/iss3/3