Citrine, Amethyst, Rose Quartz and prehnite combination necklace

Citrine or lemon quartz is the lemon yellow translucent variant of the mineral quartz (SiO2). Features Like other varieties of quartz, is a translucent citrine nesosilicaat. The yellow color is caused by trace elements, whereby in particular divalent and trivalent iron plays a role. The crystal system of istrigonal citrine and the hardness is 7. Name: The name is derived from citrus citrine (due to the yellow color). The fourth variety was, depending on the color, in the past also called Madeira topaz, gold topaz or topaz Bahía called entirely unjustified since topaz is an entirely different mineral. Probably this happened to suggest a higher preciousness. Appearance: The main sites of citrine are Brazil, Madagascar and the former Soviet Union. Amethyst is often roasted and sold as citrine. This can be identified by brown to black spots. Citrine is more valuable than Amethyst.

 
 
Looking for Amethyst and cracking the geodes.