Goethite and Star Sapphire Optical Properties

Goethite

Star Sapphire

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1 Optical Properties

1.1 Luster

Adamantine

Not Available

1.2 Pleochroism

VisibleArthur Thomas

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemstones (2009)

Transparent, Translucent

1.5 Refractive Index

2.26-2.3981.758-1.780

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

0.1380.007-0.010

0 0.296

1.9 Clarity

Gemstones (2009)

Transparent

Goethite and Star Sapphire Optic Character

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

Similar to their colors, Goethite and Star Sapphire 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, Goethite is Gemstones (2009) while Goethite is Gemstones (2009) in appearance.