(ËlÉk tÉrn) n. 1. a reading desk in a church from which the Bible lessons are read during the service. 2. a stand with a slanted top, used to hold a book, speech, etc., at the proper height for a standing reader or speaker.
How a Diamond is Formed. In order for diamond to form there must be an available source of carbon and relatively narrow ranges of temperates and pressures must align. This happens around 100 miles below the crust. Once crystalized the diamonds must be rapidly transported to the surface without undergoing substantial change.
Diamond deposits are termed primary when diamonds are found in the host igneous or volcanic rocks. The host rock types in which significant quantities of diamond can occur include kimberlite and, more rarely, orangeite and lamproite, igneous rocks with similar characteristics to kimberlite.