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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+
 
Be(PO
 
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
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH) · 4H
 
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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  • Bergslagite details from Handbook of Mineralogy (PDF)
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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., Petersen, O. V. & Johnson, O. (1984): Bergslagite, a new mineral species from Långban, Sweden: Neues Jahrbuch für Mineralogie, Monatshefte:1984, 257-262 ; Hansen, S. , Fälth, L. & Johnsen, O. (1984): Bergslagite , a mineral with tetrahedral berylloarsenate sheet anions. Zeitschrift für Kristallographie: 160: 73-80; 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)
      • 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
      • Oberhalbstein (Surses; Sursass)
        • Tinizong (Tinzen)
      • Vorderrhein Valley
        • Tujetsch (Tavetsch)
          • Curnera Valley
    		Die Mineralien der Schweiz, Max Weibel, ISBN 3-7643-2465-1
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