Ekmanite
A variety of Stilpnomelane
This page is currently not sponsored. Click here to sponsor this page.
About Ekmanite
Formula:
K4(Fe2+,Mn)48[Si64Al8]O1664(OH)52 · nH2O
According to IMA Proposal 25-B (2026), ekanite is a stilpnomelane with minor Mn.
Crystal System:
Orthorhombic
Name:
Named and first decribed by Igelström 1865 from the Brunsjö Mine (Brunnsjö Mine), Grythyttan, Hällefors, Västmanland, Sweden.
Obsolete name for a Mn-rich stilpnomelane (IMA Proposal 25-B (2026)); the name was already discredited in 1954.
The Mica Subcommittee (1998) regarded this as possibly Smectite.
The Mica Subcommittee (1998) regarded this as possibly Smectite.
Unique Identifiers
Mindat ID:
6912 (as Ekmanite)
3789 (as Stilpnomelane)
3789 (as Stilpnomelane)
Long-form identifier:
mindat:1:1:6912:6 (as Ekmanite)
mindat:1:1:3789:7 (as Stilpnomelane)
mindat:1:1:3789:7 (as Stilpnomelane)
Similar Names
| Ekanite | A valid IMA mineral species | Ca2ThSi8O20 |
| Eumanite | A synonym of 'Manganocolumbite-Manganotantalite Series' |
IMA Classification of Ekmanite
Discredited
Approval history:
IMA 25-B: Stilpnomelane group: composition range, franklinphilite and ekmanite discredited
Ekmanite is a stilpnomelane with minor Mn
Ekmanite is a stilpnomelane with minor Mn
Chemistry of Ekmanite
Mindat Formula:
K4(Fe2+,Mn)48[Si64Al8]O1664(OH)52 · nH2O
According to IMA Proposal 25-B (2026), ekanite is a stilpnomelane with minor Mn.
According to IMA Proposal 25-B (2026), ekanite is a stilpnomelane with minor Mn.
Element Weights:
Crystallography of Ekmanite
Crystal System:
Orthorhombic
Synonyms of Ekmanite
Other Language Names for Ekmanite
Radioactivity
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Ekmanite
mindat.org URL:
https://www.mindat.org/min-6912.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
Mineral Dealers:
References for Ekmanite
Reference List:
Hamberg, Axel (1889) Mineralogische Śtudien.1. Optische Eigenschaften des Ekmanit [Mineralogical studies.1. Optical properties of Ekmanite]. Geologiska Föreningen i Stockholm Förhandlingar, 11 (1) 25-27 doi:10.1080/11035898909445430
Nagy, Bartholomew (1954) Multiplicity and disorder in the lattice of ekmanite. American Mineralogist, 39 (11-12) 946-956
Localities for Ekmanite
Showing 6 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Japan | |
| Nakagawa et al. (2009) |
| Nakagawa et al. (2009) |
| Nakagawa et al. (2009) | |
Sweden | |
| Hamberg (1889) +1 other reference |
| |
USA | |
| Muir Wood (1979) +1 other reference |
Brunnsjögruvan, Grythyttan, Hällefors, Örebro County, Sweden