Amethyst
An 'amethyst' is a sometimes transparent mineral that comes from quartz. It is a type of rock. It is valued because of its violet colour. Because of this, some experts think that its colour comes from the iron in it. Heating the amethyst either takes away its colour or changes it to a yellow color. Amethysts are found in Brazil, Uruguay, Ontario, and North Carolina. The rock amethyst is the birthstone of the month February.