Ansermetite
MnV5+2O6 • 4H2O [CNMNC approved formula]
Named for Stefan Ansermet (1964-), Swiss mineralogist.
| IMA status : | Approved Species 2003 (IMA2002-017) |
| CLASSIFICATION | |
| Dana (8th edition) : |
47.01.01.03 (This Dana# Added) |
| (47) Vanadium Oxysalts | |
| (47.01) (Normal VO3) | |
| (47.01.01) Rossite Group | |
| Nickel-Strunz (10th edition) : |
04.HD.30 |
| (04) Oxides and Hydroxides | |
| (04.H) V[5+,6+] Vanadates | |
| (04.HD) Inovanadates | |
| Crystal system: | Monoclinic System |
| Point group (H-M): | 2/m — prismatic |
| Unit cell: | a = 13.17 Å, b = 10.13 Å, c = 6.983 Å, β = 111.57° |
| Crystal Habit: | scaly crusts to 0.5 mm thickness, rarely minute wedge-shaped tabular crystals to 0.1 mm |
| Twinning: | crystals prismatic |
| Color: | Carmine red to wine red |
| Diaphaneity: | Transparent |
| Luster: | Adamantine |
| Hardness (Mohs): | 3 |
| Measured Density: | 2.5 - 2.55 g/cm3 |
| Cleavage: | Perfect on {110} |
| Tenacity: | Brittle |
| Streak: | Orange |
| Geologic Setting: | Metamorphosed synsedimentary exhalative Mn deposit. Unstable in air and aqueous solutions at temperatures above ~50-85 deg. C. |