Quartz var: Ametrine (natural bi-color with a RARE ''c'' face)

Item Description

Ametrine is variety of Quartz which is named due to its color, i.e., purple AMEthyst and yellow ciTRINE. This material is rare and unique naturally bi-colored Quartz, which is most famously found at the Anahi Mine in the eastern jungle of Bolivia. Certainly, the finest Ametrine crystals ever found come from this mine. Now, I've mentioned this before, but it should be repeated that specimens labeled as coming from Brazil are not genuine because the Bolivian material is sometimes sent to Brazil for processing / polishing, and then they slap a "Made in Brazil" sticker on them, but everything is found in Bolivia. Ametrine shows distinct separate individually colored sections, which are best seen when these crystals are sliced along the "c" axis, showing an alternating "radiation" pattern of purple and yellow triangles. This piece is an attractive, colorful, gemmy etched crystal of Ametrine showing a great mixture of purple and yellow color zones, which can create a pinkish hue when blended together and viewed at a certain angle. For me, the most interesting aspect of this piece is that features a flat basal "c" face {0001] on the termination, which is VERY RARE for Quartz. It should be noted that the yellow portions of this piece are NATURAL (UNHEATED) Citrine, which is incredibly rare in nature, as most of the commercial material on the market is created by heating Amethyst to create the yellow color. A very cool crystal of this classic material. The piece weighs 154.3 grams. For reference, these crystals are sometimes priced by their gemstone or gem carving value as rough, even at a low yield of 150 carats of faceted stones, some rough dealers would have this priced at over $1,000 retail.
Ex Brian Kosnar specimen