hollandite
Sign in to saveHollandite (chemical formula: Ba(Mn4+6Mn3+2)O16) is a manganese oxide mineral. Its structure consists of double chains of MnO6 octahedra delimiting 2 × 2 tunnels. The electrostatic charge created by the Mn3+ for Mn4+ substitution is balanced by cations in the tunnels. Their nature determines the mineral species: Ba for hollandite, K for cryptomelane, Pb for coronadite, Sr for strontiomelane, Tl for thalliomelane, and Na for manjiroite. Pure species are rare and most 2 × 2 tectomanganates contain mixtures of several types of tunnel cations.
Key facts
- Mineral.name
- Hollandite
- Mineral.category
- Oxide minerals
- Mineral.image
- File:Hollandite-171530.jpg
- Mineral.formula
- Ba(Mn4+6Mn3+2)O16
- Mineral.IMAsymbol
- Hol
- Mineral.strunz
- 4.DK.05a
- Mineral.dana
- 7.9.1.1
- Mineral.system
- Monoclinic
- Mineral.class
- Prismatic (2/m)
- Mineral.symmetry
- Monoclinic H-M symbol: (2/m) Space group: I2/m
- Mineral.color
- Silvery-grey to greyish
- Mineral.cleavage
- Distinct / Good, Prismatic
- Mineral.mohs
- 4 to 6
- Mineral.density
- 4.95
via Wikipedia infobox
Wikidata facts
- Named after
- Thomas Henry Holland
- Image
- Hollandite-95021.jpg
Show 7 more facts
- Commons category
- Hollandite
- Nickel-Strunz 9th edition (updated 2009)
- 4.DK.05
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 4.DK.05a
- crystal system
- monoclinic crystal system
- IMA Mineral Symbol
- Hol
- chemical formula
- Ba(Mn⁴⁺₆Mn³⁺₂)O₁₆
- Strunz 8th edition (series ID, updated)
- IV/D.03b
via Wikidata · CC0
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Encyclopedic overview
2 sectionsContents
- See also
- References
Hollandite (chemical formula: Ba(Mn4+6Mn3+2)O16) is a manganese oxide mineral. Its structure consists of double chains of MnO6 octahedra delimiting 2 × 2 tunnels. The electrostatic charge created by the Mn3+ for Mn4+ substitution is balanced by cations in the tunnels. Their nature determines the mineral species: Ba for hollandite, K for cryptomelane, Pb for coronadite, Sr for strontiomelane, Tl for thalliomelane, and Na for manjiroite. Pure species are rare and most 2 × 2 tectomanganates contain mixtures of several types of tunnel cations.
A mineral, with the chemical composition BaMn4+6Fe3+2O16, that was first found in the Kajlidongri mine in the Jhabua district of Madhya Pradesh, India, had the name hollandite until it was reclassified as ferrihollandite by the International Mineralogical Association in 2012. Ferrihollandite is the barium-iron (III) endmember of the coronadite group.
Excerpted from Wikipedia’s “hollandite” article, available under the CC BY-SA 4.0 licence.