In review, let's take a look.................
This is a sample of genuine Turquoise, mined in the United States. Turquoise can come in many colors, depending on the mine. I have provided images of Turquoise from mines in Nevada here:
I have offered as much information as possible regarding White Turquoise, which remains controversial....I'll let you decide what to believe about this stone. All I know for sure; it's a gorgeous stone!!
Chinese turquoise is a mined stone, however, this form of Turquoise has usually been stabilized, meaning a clear epoxy has been applied to the surface to harden the stone. A side effect of the process is that stabilized stone is less likely to absorb lotions and body oils, which may change the color of the stone over time.
Because of its exotic blend of base color and dark matrix, this material is sold as African "turquoise," although it's really a jasper. This is NOT turquoise!
Chalk Turquoise is lower grade Turquoise ground up, mixed with epoxy and dye. Chalk Turquoise, in my opinion, is FAKE turquoise.
Finally, we come to another stone that is NOT Turquoise. Many suppliers and vendors will label Mosaic Magnesite as Turquoise. I guess the fact that this variety of Magnesite may contain tiny scraps of Turquoise, they feel the name is justified. I don't agree.
I hope you find these articles helpful. Generally, genuine Turquoise is becoming increasingly rare. Only 25% of the mines located in the United States are producing Turquoise. Currently, I have a source for genuine Turquoise that I use in my jewelry designs. These stones are from a supply that, once exhausted, will no longer be available. Visit my shop for more information.
Although both are gemstones, Howlite (right) and Magnesite (below) are not Turquoise. Very high quality Magnesite is available, and is often much more expensive than chalk turquoise.