Vanadinite, Baryte, Hollandite Locality: Mibladen Mining District, Midelt, Khénifra Province, Meknès-Tafilalet Region, Morocco Dimensions: 14.3 cm x 9.6 cm x 7.9 cm Photo Copyright © Rob Lavinsky & irocks Chemical Formula: 4+ 6 Mn3+ 2 )O16 Locality: Name Origin:
Color: Density: Diaphaneity: Fracture: Hardness: Luminescence: Luster: Streak:
This sample of hollandite is displayed in the Smithsonian Museum of Natural History. The sample is about 8 cm across and is from Serra do Navio, Brazil. Königsberg, Wolfstein, Palatinate, Rhineland-Palatinate, Germany © Peter Haas Quartz with Hollandite Ambatofinandrahana – Madagascar Specimen weight:54 gr. Crystal size:Up to 2 mm Overall size: 30mm x 30 mm x 50 mm © minservice
O16 Locality: Manganese deposits of the Central Provinces of India. Name Origin: Named for Thomas Henry Holland (18){kind=link}