Bertrandite and Clinochlore Optical Properties

Bertrandite

Clinochlore

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1 Optical Properties

1.1 Luster

Vitreous

Pearly, Greasy

1.2 Pleochroism

none.

Distinct: light yellow-green to light bluE

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

TransparentAnthony et al, Handbook of mineralogy (2001)

Transparent

1.5 Refractive Index

1.583-1.6141.571-1.597

1 3.25

1.6 Optic Character

Not Available

Biaxial/+

1.7 Crystal System

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

Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/m

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TransparentAnthony et al

Transparent

Bertrandite and Clinochlore Optic Character

Bertrandite and Clinochlore optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Bertrandite and Clinochlore 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 Bertrandite and Clinochlore 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. Clinochlore has Biaxial/+ character.

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Bertrandite and Clinochlore Transparency

Similar to their colors, Bertrandite and Clinochlore 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, Bertrandite is Handbook of mineralogy (2001) and TransparentAnthony et al while Bertrandite is Handbook of mineralogy (2001) and TransparentAnthony et al in appearance.