Bergslagite Mineral Data

Bergslagite Mineral Data +

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General Bergslagite Information

Chemical Formula:

CaBe(AsO4)(OH)

Composition:

Molecular Weight = 205.02 gm

Calcium 19.55 % Ca 27.35 % CaO

Beryllium 4.40 % Be 12.20 % BeO

Arsenic 36.54 % As 56.05 % As₂O₅

Hydrogen 0.49 % H 4.39 % H₂O

Oxygen 39.02 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaBe(AsO₄)(OH)

Environment:

In thin veins in pieces of hematite ore found on mine dumps from a metamorphosed Fe-Mn orebody.

IMA Status:

Approved IMA 1982

Locality:

For Langban, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

For the occurrence at Langban, which is in the Bergslagen region of Sweden.

Synonym:

ICSD 31384

PDF 36-650

Bergslagite Image

Images:

Bergslagite

Comments: White (fluorescent) veinlet of bergslagite cutting through metallic, gray hematite.
Location: Langban Mine Dump, Langban, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bergslagite Crystallography

Axial Ratios:

a:b:c =0.6251:1:1.2968

Cell Dimensions:

a = 4.8818, b = 7.809, c = 10.127, Z = 4; beta = 90.16° V = 386.06 Den(Calc)= 3.53

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.2(1), 3.519(0.8), 4.879(0.7),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Hansen S , Falth L , Johnson O , Zeitschrift fur Kristallographie , 166 (1984) p.73-80, Bergslagite, a mineral with tetrahedral, berylloarsenate sheet anions, Note: anisoB s from ICSD

Physical Properties of Bergslagite

Cleavage:

None

Color:

Colorless, Gray, Gray white, White.

Density:

3.4

Diaphaniety:

Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Bergslagite

Gladstone-Dale:

CI meas= -0.036 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1921,KPDmeas= 0.1994,KC= 0.1925

Optical Data:

Biaxial (-), a=1.659, b=1.681, g=1.694, bire=0.0350, 2V(Calc)=74, 2V(Meas)=70.

Calculated Properties of Bergslagite

Electron Density:

r_electron=3.37 gm/cc
note: r_Bergslagite=3.53 gm/cc.

Fermion Index

Fermion Index = 0.04441
Boson Index = 0.95559

Photoelectric:

PE_Bergslagite= 27.30 barns/electron
U=PE_Bergslagite x r_electron= 92.13 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bergslagite is Not Radioactive

Bergslagite Classification

Dana Class:

41.5.4.4 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.5)where (A B)2 (XO4) Zq

(41.5.4)Dana Group

41.5.4.1 Herderite CaBe(PO4)F P 2₁/a 2/m

41.5.4.2 Hydroxylherderite CaBe(PO4)(OH) P 2₁/a 2/m

41.5.4.3 Vayrynenite MnBe(PO4)(OH,F) P 2₁/a 2/m

41.5.4.4 Bergslagite CaBe(AsO4)(OH) P 2₁/c 2/m

Strunz Class:

VII/B.01-30 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of very small size: Li, Be

VII/B.01 - Herderite - Babefphite series

VII/B.01-10 Herderite CaBe(PO4)F P 2₁/a 2/m

VII/B.01-20 Hydroxylherderite CaBe(PO4)(OH) P 2₁/a 2/m

VII/B.01-30 Bergslagite CaBe(AsO4)(OH) P 2₁/c 2/m

VII/B.01-50 Vayrynenite MnBe(PO4)(OH,F) P 2₁/a 2/m

VII/B.01-60 Babefphite BaBe(PO4)(F,O) I 4₁/amd 4/m 2/m 2/m

Other Bergslagite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Bergslagite

CaBe(AsO4)(OH)
Dana No: 41.5.4.4 Strunz No: VII/B.01-30
Locality:

Notes: