Chromium Quartz is quartz crystal that has been treated in a lab to bond it with a chemical element, to create the color you see. A green color will result from using Chromium (found on the Periodic table as element symbol Cr), and bonding with Iron (Element Symbol Fe on the Periodic table) will produce yellows/oranges. The color enhancements are done in a lab using heat with a bonding process such as electroplating. The resulting vibrant colors are a human enhancement to a natural piece, marrying nature and technology to create beauty. Quartz is a mineral composed of silicon and oxygen, often found in crystal clusters. It is the second most abundant mineral in earth’s continental crust. Quartz has a hardness of 7, but hardness in quartz can be effected by the purity of the specimen.