Citrine (Grande Amethyst) keychain from Bolivia.

Citrine or lemon quartz is the lemon yellow translucent variant of the mineral quartz (SiO2). Properties Like the other varieties of quartz, the translucent citrine is a nesosilicate. The yellow color is caused by trace elements in which mainly divalent and trivalent iron play a role. The crystal system of citrine is trigonal and the hardness is 7. Name: The name citrine is derived from citrus (because of its yellow color). Depending on the color, the quartz variety has also been referred to in the past as Madeira topaz, golden topaz or topaz of Bahía, completely incorrectly because topaz is a completely different mineral. This was probably done to suggest a higher cost. Occurrence: The main sources of citrine are Brazil, Madagascar and the former Soviet Union. Amethyst is often burned and sold as Citrine. You can recognize this by brown to black points. Citrine is more valuable than Amethyst.