Ivory
Apatite with other calcium compounds and organic substance teeth or tusks of elephant, hippopotamus, walrus, and narwhal. Tusks of mammoth (fossil ivory) - Gemmological Tables, Ulrich Henn and Claudio C. Milisenda, 2004, p 5
| Ivory Treatments | |
|---|---|
| Heated or dyed with tea to darken the color - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7 | |
| Physical Properties of Ivory | |
| Mohs Hardness | 2 to 3, Gemmological Tables (2004) More from other references |
| Specific Gravity | 1.70 to 1.95, Gemmological Tables (2004) More from other references |
| Optical Properties of Ivory | |
| Refractive Index | 1.52 to 1.57, Gemmological Tables (2004) More from other references |
| Colour | |
| Colour (General) | White, yellowish, Gemmological Tables (2004) |
| Transparency | Opaque, Gemmological Tables (2004) |
| Fluorescence & other light emissions | |
| Fluorescence (General) | Most ivory: bluish white to violet blue (SW weaker), Blue Chart Gem Identification (2010) |
| Fluorescence (Long-Wave UV) | Violet-blue, Gemmological Tables (2004) |
| Crystallography of Ivory | |
| Crystal System | Amorphous, Blue Chart Gem Identification (2010) |
| Further Information | |
| Mineral information: | Ivory information at mindat.org |