Hematite and Montebrasite Optical Properties

Hematite

Montebrasite

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1 Optical Properties

1.1 Luster

Not Available

1.2 Pleochroism

O = brownish red; E = yellowish red

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

OpaqueHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references

TransparentWalter Schumann, Gemstones of the world (2001) More from other references

1.5 Refractive Index

2.690-3.2201.578-1.646

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Not Available

1.8 Birefringence

0.2800.020-0.030

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

TransparentWalter Schumann

Hematite and Montebrasite Optic Character

Hematite and Montebrasite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Hematite and Montebrasite Physical Properties like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Hematite and Montebrasite optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character.

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Hematite and Montebrasite Transparency

Similar to their colors, Hematite and Montebrasite transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Hematite is Blue Chart Gem Identification (2010) More from other references and OpaqueHerve Nicolas Lazzarelli while Hematite is Blue Chart Gem Identification (2010) More from other references and OpaqueHerve Nicolas Lazzarelli in appearance.