Nuummite and Foitite Optical Properties

Nuummite

Foitite

Add ⊕

1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

Not Available

Strong: pale lavender dark blueAnthony et al

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

TranslucentAnthony et al, Translucent

1.5 Refractive Index

1.635-1.663Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m

1.8 Birefringence

0.0170-0.230Not Available

0 0.296

1.9 Clarity

Gemmological Tables (2004) More from other references

TranslucentAnthony et al

Nuummite and Foitite Optic Character

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

Compare Green Gemstones

Nuummite Vs Phosphosiderite

Nuummite Vs Pleonaste

Nuummite Vs Pezzottaite

Nuummite and Foitite Transparency

Similar to their colors, Nuummite and Foitite 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, Nuummite is Gemmological Tables (2004) More from other references while Nuummite is Gemmological Tables (2004) More from other references in appearance.