4 Photos
Kosmochlor
Chemical Formula	NaCrSi2O6
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	6
Color	emerald green
Streak	pale green
Refractive Index	n = 1.766 n = 1.781
Cleavage	Distinct/Good

Kosmochlor: sodium chromium pyroxene jade green color is formed the major minerals, a small amount of sodium chromium pyroxene omphacite distribution, content of more than 95%.

Sodium chromium pyroxene jade crystal was microscopic columnar aggregates, because of the stress with wavy extinction characteristics, so often has become crystalline. Grain size is 0.1 × 0.01mm, some up to 0.5 × 0.1mm, cylindrical development, {110} clear cleavage.

Refractive index of Nm=1.740, Np=1.725, Ng=1.745.

Sodium chromium pyroxene multicolor is very remarkable, multicolor Nm= green yellow green green, Np=, Ng=.

Two axis crystal optical, optical angle =65 - 70°, 30°oblique extinction, extinction angle.

Testing

English name Ureyite monoclinic pyroxene mineral gemstone. Chemical type nacrsi2o6. This mineral is nature is very rare jewel, the first people in lunar minerals found in its presence. Later, it is found in Burma jade rock. Jade is called dry green one of the major compositions. A light green deep green, the average refractive index 1.75. The hardness of 5.

The electron probe, X ray diffraction and absorption spectroscopy study of jade sodium chromium pyroxene mineralogy. The results showed, sodium chromium pyroxene jade is a symbiotic relationship, the formula ( Na0.83Ca0.02 ) ( Cr0.78Al0.10Fe0.08Mg0.02 ) Si2.06O6, the lattice parameters a=9.530 ( A ), b=8.672 ( A ), c=5.264 ( A ),β =107.51 °, V=414.88, density of 3.55 g/cm3 sodium, Ge Huishi Cr3+ crystal field transition is determined by it’s the extent of different hues of green.