Chemical Formula: Ba(Mn4+6Mn3+2)O16 Locality: Manganese deposits of the Central Provinces of India. Name Origin: Named for Thomas Henry Holland (1868-1947), Director of the Indian Geologic Survey.
Physical Properties of Hollandite
Color:Â Grayish black, Black, Silver gray. Density: 4.7 – 5, Average = 4.84 Diaphaneity: Opaque Fracture: Brittle – Generally displayed by glasses and most non-metallic minerals. Hardness: 4-6 Luminescence: Non-fluorescent. Luster: Earthy (Dull) Streak: black
O16 Locality: Manganese deposits of the Central Provinces of India. Name Origin: Named for Thomas Henry Holland (18){kind=link}