Gemstone: Morganite (Beryl)Quartz also occurs in a variety of other varieties, all with different names.Pure quartz is commonly referred to as rock crystal and is colorless.Opaque white quartz is called milky quartz.Purple quartz is called amethyst and the color is due to missing electrons combined with iron impurities.Yellow quartz is called citrine and its color is due to iron impurities.Milky pink quartz is called rose quartz and its color is due to impurities of titanium, iron and manganese.Milk quartz whose white color is formed by liquid, gas - or both, having become enclosed in the crystal molecules themselves during crystal formation.Gray or brownish quartz is called smoky quartz (or smoky quartz). Its color is due to missing electrons combined with aluminum impurities.Green quartz is called Prasiolite, which is also called prasem. It is a very rare crystal.Herkimer diamond is an extra clear and energetic quartz that always has 2 points. It kind of sparkles about it.Chalcedony is an example of a cryptocrystalline quartz that is mixed with morganite.