The steering wheel features a removable brooch set with amethyst, topaz, and citrine stones. Business flourished in precious stones such as diamonds, lapis lazuli, onyx, topaz, carbuncles and emeralds. The jewels in the item include emeralds, sapphires, topaz, rubies, and diamonds. Certain stones such as rubies, sapphires, tourmalines and topaz are optically anisotropic. Job places it in the same category with gold, onyx, sapphire, glass, coral, topaz, etc. Minerals of note are&colon; gold, hematite, dolomite, tourmaline, pyrite, muscovite, topaz and imperial topaz. The American Golden Topaz, a more recent gem, weighed a massive 22,892.5 carats. Associated minerals include bixbyite, quartz, orthoclase, topaz, spessartine, pseudobrookite and hematite. Typical associated minerals include&colon; kyanite, andalusite, topaz, mica and quartz. The Topaz of Aurangzeb, observed by Jean Baptiste Tavernier weighed 157.75 carats. Other orthosilicates include zircon, staurolite, and topaz. Naturally occurring blue topaz is quite rare. Displayed at right is the color smokey topaz. Other minerals such as topaz contain fluorine. An English superstition also held that topaz cured lunacy.