NATURAL RARE TOURMALINE CATS EYE 1.72 Cts – SRI LANKA GEMSTONE 15495

100% Natural – Not treated in any way.
Rare Colectors Gem !
Suitable for Museums,Institutions and Students of Gemology.
Beautiful sharp Catseye effect.
Among the Rarest of gemstones.

RI:1.624(+.005, -.005) - 1.644
Hardness: 7-7.5
CC: (NaCa)(LI,MgFe,Al)9B3Si6(O,OH)31
Density: 3.06 (.05, +.15)
Crystal Group: Hexagonal

Some Tourmalines contain tiny, parallel inclusions, causing them to display a strong chatoyancy and are cut en-cabochon to cats-eyes,which are rare- a collector’s gem.Tourmaline comes from the Singhalese (Sri Lankan) words‘tura mali’ – gem with several colors. Tourmalines come in a variety of colors, some have two or more colors, some even color-changing.