Hematite and Colemanite Optical Properties

Hematite

Colemanite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

O = brownish red; E = yellowish red

NilArthur Thomas

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

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

Transparent

1.5 Refractive Index

2.690-3.2201.584-1.615

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a

1.8 Birefringence

0.2800.028-0.030

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

Transparent

Hematite and Colemanite Optic Character

Hematite and Colemanite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Hematite and Colemanite 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 Colemanite 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 Colemanite Transparency

Similar to their colors, Hematite and Colemanite 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.