The method of preparation of crystalline boron by the U.S. Borax & Chemical Corporation involves (1) preparation of Moissan boron of about 89% purity, (2) upgrading the Moissan boron to 95% B by heating with fluorides, and (3) heating the upgraded boron by radiation in a vacuum. The ...
or marble or other silicious or calcareous material(s). Materials are combined with a suitable quantity of alum which is intended to react with the calcium carbonate containing materials to form calcium sulphate and aluminum hydroxide. Other materials such as casein compound, borax and hydrated lime...
isostructural groups (those whose members share a common structure type): (1)antimony,arsenic, andbismuth, with the latter two being more common in nature, and (2) the rather uncommonseleniumandtellurium.Carbon, in the form ofdiamondandgraphite, andsulfurare the most important native nonmetals....