Lonsdaleite static press or using explosives. It has also been produced by chemical vapor deposition, and also by the thermal decomposition of a polymer, poly(hydridocarbyne), at atmospheric pressure, under argon atmosphere, at . It is translucent, brownish-yellow, and has an index of refraction of 2.40 to 2.41 and a specific gravity of 3.2 to 3.3. Its hardness is theoretically superior to that of cubic diamond (up to 58% more), according to computational simulations, but natural specimens exhibited somewhat lower hardness through a large range of values (from 7 to 8 on Mohs hardness scale). The cause is speculated as being due
Topaz Energy and replaced with a number of Topaz convenience store brands including Topaz Restore and Topaz Express. As of 2012, Topaz operated 118 Company Owned Company Operated (COCO) sites in the Republic of Ireland and 1 site in Larne, County Antrim, Northern Ireland Billionaire Denis O'Brien owned Topaz, having bought €300 million of its loans from Irish Bank Resolution Corporation (IBRC). In May 2014, O'Brien appointed former Taoiseach Brian Cowen to the board of Topaz to join himself, his nephew (who is also CEO of Smiles Dental), Sean Corkery (CEO of O'Brien's SiteServ), Lucy Gaffney (chairperson of O'Brien's Communicorp) and Colm