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Hollandite (chemical formula: Ba(Mn4+6Mn3+2)O16) is an 
oxide mineral
The oxide mineral class includes those minerals in which the oxide anion (O2−) is bonded to one or more metal alloys. The hydroxide-bearing minerals are typically included in the oxide class. The minerals with complex anion groups such as the ...
. It is the barium-manganese (III) endmember
An endmember (also end-member or end member) in mineralogy is a mineral that is at the extreme end of a mineral series in terms of purity of its chemical composition. Minerals often can be described as solid solutions with varying compositions of ...
of the 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 ...
group.
A mineral, with the chemical composition BaMn4+6Fe3+2O16, that was first found in the Kajlidongri mine in the Jhabua district
Jhabua is a district of Madhya Pradesh state in central India. The town of Jhabua is the administrative headquarters of the district.
Geography
Jhabua district lies in the western part of Madhya Pradesh. It is surrounded by Dahod and Chhota ...
of Madhya Pradesh
Madhya Pradesh (, ; meaning 'central province') is a state in central India. Its capital is Bhopal, and the largest city is Indore, with Jabalpur, Ujjain, Gwalior, Sagar, and Rewa being the other major cities. Madhya Pradesh is the second ...
, India, had the name ''hollandite'' until it was reclassified as ''ferrihollandite'' by the International Mineralogical Association
Founded in 1958, the International Mineralogical Association (IMA) is an international group of 40 national societies. The goal is to promote the science of mineralogy and to standardize the nomenclature of the 5000 plus known mineral species. Th ...
in 2012. Ferrihollandite is the barium-iron (III) endmember of the coronadite group.
Rare quartz inclusion
See also
*Manganese dioxide
Manganese dioxide is the inorganic compound with the formula . This blackish or brown solid occurs naturally as the mineral pyrolusite, which is the main ore of manganese and a component of manganese nodules. The principal use for is for dry-ce ...
References
{{Reflist Barium minerals Manganese(III,IV) minerals Oxide minerals