Laurentthomasite is a newly found mineral in Madagascar.

Laurentthomasite is a mineral that was recently approved by the International Minerals Association (IMA) in 2019. It's appealing not only as a newly discovered mineral, but also as an excellent translucent and attractively coloured gemstone. We might be able to test some samples in the coming days. I'd like to share our calculated 

property with you.

The basic gemmological property

　Theoretically is R.I. is 1.540-1.545 (uniaxial +) but our tested samples showed 1.555-1.560 (uniaxial +). The S.G is about 2.67. The crystal system is hexagonal. And it shows strong pleochroism as blue and yellow.

The hardness is about 6.

     Laurentthomasite