Fluororichterite
Fluororichterite is a gem that is incredibly rare. It absolutely was only recently approved by the IMA as a mineral that is new 1993. Fluororichterite is usually only found as opaque, black to very dark crystals which can be green a mine in Wilberforce, Ontario, Canada. A realize that is recent Pakistan produced small, transparent, near colourless crystals suitable for faceting. This find produced extremely material that is little so gems are very difficult to have.
| Category: | Silicate mineral |
| Formula: | Na(Na,Ca)Mg5Si8O22F2 |
| Crystallography: | Monoclinic – Prismatic |
| Crystal Habit: | Prismatic crystals with a nearly diamond shaped cross-section with the four points usually cut by minor prism faces. |
| Twinning: | Commonly seen and results in a groove or notch running down the “spine” of the prismatic crystals. |
| Cleavage: | Imperfect in two directions |
| Fracture: | Uneven |
| Tenacity: | Brittle |
| Hardness (Mohs): | 5.0 – 6.0 |
| Density: | 3.17 (g/cm3) |
| Luminescence: | None |
| Radioactivity: | Not Radioacitve |
| Color: | Dark Green, Gray, Black, Brownish-Red, Rose-Red, Yellow; also very rarely Colorless |
| Transparency: | Opaque, Translucent; also very rarely Transparent |
| Luster: | Vitreous, Pearly |
| Refractive Index: | n/a |
| Birefringence: | n/a |
| Dispersion: | n/a |
| Pleochroism: | n/a |
