also known as Golden Topaz, is an aluminum silicate fluoride hydroxide mineral that crystallizes in the form of small prismatic crystals. The color is usually a dark orange that may be semi-transparent, but can also be seen as light red-orange-yellow as well. This color of Topaz can occur naturally, although it is extremely rare. This has led to the market being flooded with heat treated and dyed Colorless Topaz which is being sold as natural Imperial Topaz.