It is hard to believe that the tropical teal and violet hues of our Granadilla necklace originated in the earth. While the dramatic quartz points have been helped along by science in that they have been coated with a thin layer of titanium via magnetron ionization*, the stones surrounding them are naturally brilliant in hue.
The violet stones are phosphosiderite, a composite of phosphorus and iron, sidero in Greek. While small crystals of phosphosiderite are found around the globe, the current crop of massive lavender-colored rough stone hails from Chile. Its density and hardness are similar to turquoise, so it is most likely treated with epoxy resin to make it more suitable for cutting. Its origins and treatment are currently a hot topic in online forums.
The peacock-colored stones are apatite, another phosphate mineral whose name translates from the Greek apate as fraud because it has often been confused for other more valuable stones including peridot and Paraiba tourmaline. What the gem industry calls apatite is actually fluorapatite, one of several minerals that are collectively called apatite. While apatite is the most common rock-forming mineral in the world, gem quality fluorapatite is much less common. The two most sought-after colors are the neon blue-green color from Madagascar and the primavera green that was once referred to as ‘asparagus stone’. Apatite is the defining mineral for 5 on the mohs scale of hardness. As this is relatively soft for a gemstone, apatite is best used in earrings and necklaces and not rings. Fortunately for you, Granadilla can be found on the necklaces page of our website. (Granadilla is no longer available)
* the coating has a high hardness, good corrosion resistance, and low sliding wear coefficient.