Grossular is the most varicolored of the Garnets. The term Garnet describes a group name for several closely related minerals that form important gemstones, and Grossular is an individual member mineral of the Garnet group. Pure Grossular is colorless; the wide range of colors in this Garnet is caused by various impurities. Some Grossular types have their own unique variety or trade names, and are only called by these names in the gemstone market. The orange-brown Hessonite and deep green Tsavorite varieties are the best known varieties. In the gem trade, the term Grossularite is synonymous with Grossular, and both names are acceptable names for describing this gemstone.
| Chemical Formula | Ca3Al2Si3O12 |
| Color | White, Colorless, Red, Green, Yellow, Orange, Brown, Pink, Purple, Gray |
| Hardness | 6.5Â -Â 7.5 |
| Crystal System | Isometric |
| Refractive Index | 1.738Â -Â 1.745 |
| SG | 3.6 |
| Transparency | Transparent |
| Double Refraction | None |
| Luster | Vitreous to adamantine |
| Cleavage | None |
| Mineral Class | Grossular (Garnet) |
No comments:
Post a Comment