Trillion Cut Stone With Matching Crystal
Stone of the Month Triphylite
Triphylite is a rather scarce phosphate mineral with formula Li (Fe, Mn) PO4 It is found in various part of the world, but is difficult to find faceting material. The hardness is 4-5. Optical Data of Triphylite. Type: Biaxial (-). RI values: nα = 1.689 – 1.705 nβ = 1.685 – 1.710 nγ = 1.685 – 1.720. Birefringence: 0.008. Max Birefringence: δ = 0.004. The S.G. 3.43 – 3.56 The Crystal System: Orthorhombic This stone comes from Brazil and is eye clean and shows a color change in the incandescent light this is a rare stone.