Hemimorphite and Bertrandite Optical Properties

Hemimorphite

Bertrandite

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1 Optical Properties

1.1 Luster

Vitreous, Adamantine, Silky

Vitreous

1.2 Pleochroism

AbsentWalter Schumann

none.

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.614-1.6361.583-1.614

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21

1.8 Birefringence

0.022Not Available

0 0.296

1.9 Clarity

Transparent

TransparentAnthony et al

Hemimorphite and Bertrandite Optic Character

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

Similar to their colors, Hemimorphite and Bertrandite 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, Hemimorphite is Translucent and Transparent while Hemimorphite is Translucent and Transparent in appearance.