Amethyst is a violet variety of quartz that owes its color to gamma irradiation & iron impurities. Amethyst crystals like these grow in cavity spaces within rocks. The more space they have, the larger they can grow. Typically the bulk of the purple color is located right beneath the tip, but sometimes you can find crystals that are saturated pretty evenly.
The neat cluster from Minas Gerais Brazil has a interesting shape, but it self standing so it would look great on display. The small crystals that grow along its curve increase in size just a little bit, & there is bit of a color gradient along the whole cluster.
Metaphysically Used to enhance spiritual awareness & to promote a higher consciousness, Amethyst works with your Third Eye Chakra to balance vision & intuition. Great for meditation and providing a calming energy in general.