Hardystonite and Apatite Optical Properties

Hardystonite

Apatite

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1 Optical Properties

1.1 Luster

Vitreous, Resinous, Greasy

Vitreous

1.2 Pleochroism

Not Available

Blue stones – strong

1.3 Dispersion

NA0.01

0.007 1

1.4 Transparency

Handbook of mineralogy (2001)

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.6721.628-1.651

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

tetragonal

Hexagonal

1.8 Birefringence

Not Available0.002-0.008

0 0.296

1.9 Clarity

Handbook of mineralogy (2001)

TransparentUlrich Henn and Claudio C. Milisenda

Hardystonite and Apatite Optic Character

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

Similar to their colors, Hardystonite and Apatite 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, Hardystonite is Handbook of mineralogy (2001) while Hardystonite is Handbook of mineralogy (2001) in appearance.