Specific gravity: 4.95
Colour: Slivery grey to black
Hollandite is a primary mineral in contact metamorphic manganese ores,
and a secondary weathering product of
manganese-bearing minerals, associated with bixbyite,
braunite piemontite and
other manganese oxides
At Ilfeld, Harz mountains, Germany, hollandite occurs rarely in fissures in massive manganite ores, or encrusting baryte (Minrec 41.6.493).
At Kajlidongri, Jhabua state, India, hollandite occurs in quartz veins traversing a manganese orebody (Dana).
At Nuba Mountain, Kordofan Province, Sudan, hollandite occurs intergrown with pyrolusite (Dana).
Common impurities: Fe,Pb,K,Na
Back to Minerals