Johachidolite
Johachidolite can be an very borate that is rare that until a recent discover in Mogok, Myanmar (Burma) ended up being only present in minute grains no bigger than 1 mm in North Hamgyong Province, North Korea. Johachidolite forms transparent colorless, pale yellow, yellow, orange, brown equant subhedral crystals with vitreous lustre. the fabric has robust whitish blue visible light below LWUV. 1st treasure that is faceted created in 1998 from a pale yellow crystal found in the Mogok region (see Journal of Gemmology, 1999, Vol. 26, no. 5). There are currently only a small amount of gems in existence and the source that is only the recent find in Mogok.
| Chemical Formula: | CaAlB3O7 |
| Calcium Aluminum Borate | |
| Molecular Weight: | 211.49 gm |
| Composition: | Calcium | 18.95 % | Ca | 26.52 % | CaO |
| Aluminum | 12.76 % | Al | 24.11 % | Al2O3 | |
| Boron | 15.33 % | B | 49.38 % | B2O3 | |
| Oxygen | 52.96 % | O | |||
| 100.00 % | 100.00 % | = TOTAL OXIDE |
| Crystallography: | Orthorhombic – Dipyramidal |
| Crystal Habit: | Equant subhedral crystals, to 1 mm, typically granular and lamellar masses. |
| Twinning: | None |
| Cleavage: | On {201}, a parting. |
| Fracture: | Subconchoidal |
| Tenacity: | Brittle |
| Moh’s Hardness: | 7.5 |
| Density: | 3.37 – 3.45 (g/cm3) |
| Luminescence: | Some specimens show strong whitish-blue fluorescence under LW UV and pale blue to purple fluorescence under SW UV, with weak phosphorescence |
| Radioactivity: | Not Radioactive |
| Color: | Colorless, White, Pale Yellow, Yellow |
| Transparency: | Transparent to Translucent |
| Luster: | Vitreous (glassy) |
| Refractive Index: | 1.712 – 1.729 Biaxial ( + ) |
| Birefringence: | 0.0140 |
| Dispersion: | Relatively Strong; r > v |
| Pleochroism: | None |
