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Bergslagite

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Tennvatn pegmatite, Sørfold, Nordland, Norway
© Tomas Husdal

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Formula:
CaBeAsO
 
4
(OH)
System:MonoclinicColour:Colourless, white, grey, ...
Lustre:Vitreous, GreasyHardness:5
Name:For its occurrence at Långban, which is in the Bergslagen region of Sweden.
This page provides mineralogical data about Bergslagite.

Classification of Bergslagite

IMA status:Approved 1983
Strunz 8th edition ID:7/B.01-30
Nickel-Strunz 10th (pending) edition ID:8.BA.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
A : With small and medium-sized cations
Dana 8th edition ID:41.5.4.4

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
Hey's CIM Ref.:20.2.16

20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
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Type Occurrence of Bergslagite

Type Locality:Långban, Filipstad, Värmland, Sweden
General Appearance of Type Material:As thin veinlets in hematite ore
Place of Conservation of Type Material:University of Copenhagen, Copenhagen, Denmark
National Museum of National History, Washington D.C., USA; 162582
Year of Discovery:1975
Associated Minerals at type locality:
TilasiteTilasiteSvabiteSchefferiteCalcite
Baryte

Physical Properties of Bergslagite

Lustre:Vitreous, Greasy
Diaphaneity (Transparency):Translucent
Colour:Colourless, white, grey, dark grey-brown, brownish black, green, pink
Hardness (Mohs):5
Fracture:Irregular/Uneven
Density (measured):3.4 g/cm3
Density (calculated):3.4 g/cm3

Crystallography of Bergslagite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
Cell Parameters:a = 4.88Å, b = 7.8Å, c = 10.12Å
β = 90.16°
Ratio:a:b:c = 0.626 : 1 : 1.297
Unit Cell Volume:V 385.21 ų (Calculated from Unit Cell)
Z:4
Morphology:elongated flattened crystals to 1 cm; crusts
X-Ray Powder Diffraction:
d-spacingIntensity
3.200 (10)
3.519 (8)
4.879 (7)
3.905 (7)
3.046 (7)
2.917 (7)
2.409 (6)

Optical Data of Bergslagite

Type:Biaxial (-)
RI values: nα = 1.659 - 1.660 nβ = 1.678 - 1.681 nγ = 1.690 - 1.694
2V:Measured: 70° , Calculated: 74° to 78°
Maximum Birefringence:δ = 0.031 - 0.034

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r >> v

Chemical Properties of Bergslagite

Formula:
CaBeAsO
 
4
(OH)
Essential elements:As, Be, Ca, H, O
All elements listed in formula:As, Be, Ca, H, O
Common Impurities:Si

Relationship of Bergslagite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BA.05Väyrynenite
Mn
2+
 
BePO
 
4
(OH,F)
8.BA.10Herderite
CaBePO
 
4
(F,OH)
8.BA.10Hydroxylherderite
CaBe(PO
 
4
)(OH,F)
8.BA.15Babefphite
BaBePO
 
4
(F,OH)
Related Minerals - Hey's Index Grouping:

- +
20.2.1Bearsite
Be
 
2
(AsO
 
4
)(OH) · 4H
 
2
O
20.2.2Brassite
Mg(HAsO
 
4
) · 4H
 
2
O
20.2.3Rösslerite
Mg(HAsO
 
4
) · 7H
 
2
O
20.2.4Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.2.5Weilite
Ca(HAsO
 
4
)
20.2.6Johnbaumite
Ca
 
5
(AsO
 
4
)
 
3
OH
20.2.7Haidingerite
CaHAsO
 
4
 · H
 
2
O
20.2.8Pharmacolite
Ca(HAsO
 
4
) · 2H
 
2
O
20.2.9Sainfeldite
CaCa
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
20.2.10Vladimirite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 5H
 
2
O
20.2.11Guérinite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 9H
 
2
O
20.2.12Ferrarisite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 9H
 
2
O
20.2.13Rauenthalite
Ca
 
3
(AsO
 
4
)
 
2
 · 10H
 
2
O
20.2.14Phaunouxite
Ca
 
3
(AsO
 
4
)
 
2
 · 11H
 
2
O
20.2.15Mcnearite
NaCa
 
5
(AsO
 
4
)(HAsO
 
4
)
 
4
 · 4H
 
2
O
20.2.17Adelite
CaMg(AsO
 
4
)(OH)
20.2.18Talmessite
Ca
 
2
Mg(AsO
 
4
)
 
2
 · 2H
 
2
O
20.2.19Irhtemite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
20.2.20Camgasite
CaMg(AsO
 
4
)(OH) · 5H
 
2
O
20.2.21Picropharmacolite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 11H
 
2
O
20.2.22Bariopharmacosiderite
Ba
 
0.5
Fe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 5H
 
2
O

Other Names for Bergslagite

Synonyms:
IMA1983-021
Other Languages:
German:Bergslagit
Russian:Бергслагит
Spanish:Bergslagita

Other Information

Fluorescence in UV light:SW-UV: pale shades of yellowish brown, greenish or bluish
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Bergslagite

Reference List:

- +
- Hansen, S., Fälth, L., Petersen, O. V. & Johnson, O. (1984): Bergslagite, a new mineral species from Långban, Sweden: Neues Jahrbuch für Mineralogie, Monatshefte: 1984, 257-262. [Amer. Mineral. 70:436 (1985) (abstract)].

- Hansen, S. , Fälth, L. & Johnsen, O. (1984): Bergslagite , a mineral with tetrahedral berylloarsenate sheet anions. Zeitschrift für Kristallographie: 160: 73-80. [Amer. Mineral. 70:436 (1985) (abstract)].

- Kolitsch, Uwe (1996): Mineralien-Welt: 7(5):45-46.

- American Mineralogist: 74: 951.

Internet Links for Bergslagite

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    • Localities for Bergslagite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Bavaria
      • Franconia
        • Spessart
          • Hösbach
            • Sailauf
              • Hartkoppe
    		U. Kolitsch (1996): Bergslagit aus dem Rhyolithsteinbruch bei Sailauf im Spessart. Mineralien-Welt 7 (5), 45-46. (in German)
    Italy
     
    • Piedmont
      • Verbano-Cusio-Ossola Province
        • Ossola Valley
          • Baceno
            • Devero Alp (Devero Valley; Val Devero)
    		Anthony, Bideaux, Bladh, Nichols: Handbook of Mineralogy, Vol. IV
    Norway
     
    • Nordland
      • Sørfold
    		Raade, G., Kolitsch, U. and Husdal, T.A. (2006): Si-rich bergslagite from a granitic pegmatite at Tennvatn, north Norway. GFF 128, 65-68.
    Sweden
     
    • Värmland
      • Filipstad
    		Hansen, S. , Fälth, L. & Johnsen, O. (1984): Bergslagite , a mineral with tetrahedral berylloarsenate sheet anions. Zeitschrift für Kristallographie: 160: 73-80; Neues Jahrb.,Mh.(1984) 257-262; Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
    Switzerland
     
    • Grischun (Grisons; Graubünden)
      • Albula Valley
        • Oberhalbstein (Surses; Sursass)
          • Tinizong (Tinzen)
      • Hinterrhein Valley
        • Ferrera Valley
          • Ausserferrera
    		Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 362.
          • Starlera Valley
      • Vorderrhein Valley
        • Tujetsch (Tavetsch)
          • Curnera Valley
    		Die Mineralien der Schweiz, Max Weibel, ISBN 3-7643-2465-1
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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