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Akrochordite from
Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden


02626630017364121469802.jpg
Akrochordite, etc.

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden
02626630017364121469802.jpg
Akrochordite, etc.

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden
02313050017272008739435.jpg
Akrochordite, etc.

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden
Locality type:Mine
Classification
Species:Akrochordite
Formula:MnMn2Mn2(AsO4)2(OH)4(H2O)4
Comments:There were at least 3 different finds of akrochordite made at Långban:
Origially found as aggregtes of minuite sub-parallel crystals in small ammount in druses lined with unusually stable pyrochroite crystals and barite crystals. It was found in the "Japan" workings of the Långban mines, at a depth of about 100 meters. The first find consisted of seven specimens (Flink, 1922)

The second type was of a handful of specimens with pale pink aggregates of Akrochordite to 2 mm with Eveite, Brandtite and an unknown Mn-arsenate. (Moore et al.,1989)

A small find was also made on the dumps at the mine in the early 1990s consisting of very small (less than 1 mm) single crystals in fractures. (Knut Eldjarn, 2009)
Colour:red brown with a peculiar yellowish tint
Confirmation
Validity:Valid - Type Locality
Associated Minerals:
Associates:Baryte
Dolomite
Hausmannite
Pyrochroite
Associated Minerals Based on Photo Data:
Eveite4
Manganohörnesite2
Calcite1
Långbanshyttanite1
Data
Mineral Data:Click here to view Akrochordite data
Locality Data:Click here to view Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden
Data Identifiers
Mindat Occurrence Record ID:287
Long-form Identifier:1:3:287:7
GUID (UUID V4):0
Localities for Akrochordite in this Region
Japan working, Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden
Nearest other occurrences of Akrochordite
0.4km (0.2 miles) ⓘJapan working, Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden
8.2km (5.1 miles) ⓘMoss mine, Nordmark Odal Field, Filipstad, Värmland County, Sweden
References
Palache, Charles; Berman, Harry; Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons.
Moore, Paul Brian, Gupta, Pradip K. Sen, Schlemper, Elmer O. (1989) Akrochordite, (Mn,Mg)5(OH)4(H2O)4(AsO4)2: A sheet structure with amphibole walls. American Mineralogist, 74 (1-2) 256-262
Holtstam, Dan, Langhof, Jörgen - Eds. (1999) Långban - The mines, their minerals, geology and explorers. Raster Förlag; Swedish Museum of Natural History, Stockholm. p.1-216.
 
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