(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.
By depositing diamond on a diamond crystal (seed crystal) the size of the crystal can be increased. In this case new carbon atoms are added to the existing diamond lattice. This is called homoepitaxy. On non-diamond substrates a pretreatment of the surface is necessary to allow diamond formation.