Vanadinite
| Refractive Index : 2.416 – 2.350 |
| Optical Characteristic : DR, Uniaxial negative |
| Specific Gravity : 7.10 – 6.80 |
| Formula : Pb5(VO4)3CI |
| Crystal System : Hexagonal |
| Variety/Species : Vanadinite |
| Species/Group : Apatite Group |
| Birefringence : 0.066 |
| Dispersion : 0.202 |
| Hardness : 3.5 to 4 |
| Toughness : Poor |
| Ultrasonic : Never |
| Steam : Never |
| UV Long : Inert |
| UV Short : Inert |
| Pleochroism : 2 colors |
| Strength : weak |
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| Pleochroism Colors : Very weak shades of orange and yellow |
| Heat : Sensitive |
| Acids : Sensitive |
| Light : Stable |
| Polish Luster : Resinous to adamanitine |
| Fracture : Conchoidal |
| Fracture Luster : |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : |
| Enhancements : None |
| Cleavage : None |
| Color Range : Red, orange, orange-red, brownish red, brownish yellow, yellow, pale yellow, brown (rarely), colourless |
| Transparency : Transparent to opaque |
| Phenomena : None |
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| Separations : Vanadinite from- |
| Identifying Characteristics and information Brittle, Often color zoned. Extremely rare but with a rich and beautiful color. Faceted gems almost always less than 1 carat |
| Spectral Data Not diagnostic |
| Trade Names and Misnomers Endlichite Vanadinite |
Tags: Apatite Group, Endlichite, Vanadinite
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