What You Need To Know About Onyx Countertops
Onyx is actually mostly quartz, with some silica. It comes in many colors. The black onyx we’re used to comes from boiling it in a sugar solution, and then treating it with hydrochloric or sulfuric acid to carbonize the sugars. This has a beautiful recognized look and it is very hard (7 on the Moh’s Scale of Hardness). Onyx takes a high polish. It will cost you, but if that’s the look you’re going for, there’s no substitute.