Vivianite
| Refractive Index : 1.675 – 1.569 |
| Optical Characteristic : DR, biaxial negative |
| Specific Gravity : 2.68-2.64 |
| Formula : Fe3(PO4)2.8H2O |
| Crystal System : Monoclinic |
| Variety/Species : All |
| Species/Group : Vivianite |
| Birefringence : 0.049 – 0.059 |
| Dispersion : |
| Hardness : 1.5 to 2 |
| Toughness : Poor |
| Ultrasonic : Never |
| Steam : Never |
| UV Long : Inert |
| UV Short : Inert |
| Pleochroism : 2 colors |
| Strength : Strong |
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| Pleochroism Colors : Intense blue to indigo/pale yellowish green or bluish green |
| Heat : Sensitive |
| Acids : Sensitive |
| Light : Stable |
| Polish Luster : Vitreous to pearly |
| Fracture : Fibrous or sectile |
| Fracture Luster : Vitreous |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : |
| Enhancements : None |
| Cleavage : Perfect in 1 direction |
| Color Range : Colorless, green, blue, bluish green, (dark) greenish |
| Transparency : Transparent to opaque |
| Phenomena : None |
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| Separations : Vivianite from- |
| Identifying Characteristics and information Bluish white streak.Vivianite darkens spontaneously. so an attractive colored stone becomes less so, over time. |
| Spectral Data Not diagnostic |
| Trade Names and Misnomers Fossile Turquoise(M) Ivory Turquoise(M) Odontolite Tooth turquoise(M) Vivianite |
Tags: Fossile Turquoise, Ivory Turquoise, Odontolite, Tooth turquoise, Vivianite
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