Is Jasper a quartz? - Quora
Apr 30, 2020 · This form is opaque, and sometimes called milky quartz or chalcedony. Chalcedony forms through deposits of layers of colored material, such as agate, jasper, and carnelian . Quartz can also appear mixed in with other geologic material, as is the case with granite and sandstone .What is Amethyst? Amethyst is the world's most popular purple gemstone.It is the purple color variety of quartz and has been used in personal adornment for over 2000 years. It is the birthstone of February and an important New Age gem. Amethyst is used to produce faceted stones, cabochons, beads, tumbled stones, and many other items for jewelry and ornamental use.