| Sudoite | |
|---|---|
| General | |
| Category | Chlorite_group |
| Formula (repeating unit) | Mg2Al3(Si3Al)O10(OH)8 |
| Crystal system | Monoclinic |
| Identification | |
| Color | White to light green |
| Mohs scale hardness | 2.5–3.5 |
| Luster | pearly, dull |
| Refractive index | nα = 1.581 à 1.583 nβ = 1.584 à 1.589 nγ = 1.591 à 1.601 |
| Birefringence | biaxial (-) ; δ = 0.010 to 0.018 2V = 64 to 70° (measured) 2V = 68 to 72° (calculated) |
| References | [1][2] |
Sudoite is a mineral from the chlorite group. It was named after Toshio Sudo (1911-2000), professor of mineralogy at the University of Tokyo, in Japan, and a pioneer of clay science.[3] The mineral tosudite also bears his name. It was approved as a valid species by the International Mineralogical Association in 1966.