Coronadite
Coronadite is a black monoclinic mineral containing a ternary oxide of lead and manganese in two oxidation states. The mineral was named after Francisco Vasquez de Coronado who was an explorer of southwest USA. The name was made up by Waldemar Lindgren in 1905.[1]
| coronadite | |
|---|---|
 Coronadita | |
| General | |
| Category | hydroxides |
| Formula (repeating unit) | Pb(Mn4+6Mn3+2)O16 |
| Strunz classification | 4/D.08-70 |
| Dana classification | 7.9.1.4 |
| Crystal system | monoclinic |
| Space group | I2/m |
| Unit cell | a=9.938, b=2.8678, c=9.834, Z = 1; β= 90.39° V = 280.26 |
| Identification | |
| Formula mass | 933.55 |
| Colour | dark grey to black |
| Crystal habit | Botryoidal; fibrous |
| Mohs scale hardness | 4.5-5 |
| Luster | submetallic |
| Streak | brownish black |
| Diaphaneity | opaque |
| Density | 5.44 |
| Refractive index | 2.72? |
| Pleochroism | brown-grey |
| Common impurities | Fe, Al |
References
- "Coronadite Mineral Data". webmineral.com.
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