Allanite
| Physical Properties of Allanite | |
|---|---|
| Specific Gravity | 3.40 to 4.20, Tables of Gemstone Identification (2007) |
| Optical Properties of Allanite | |
| Refractive Index | 1.64 to 1.828, Tables of Gemstone Identification (2007) |
| Birefringence | 0.013 to 0.036, Tables of Gemstone Identification (2007) |
| Colour | |
| Colour (General) | Brownhttp://minerals.caltech.edu (2012) |
| Causes of Colour | Colored by iron and radiation damage and possibly by rare earth elementshttp://minerals.caltech.edu (2012) |
| Further Information | |
| Mineral information: | Allanite information at mindat.org |