Berzeliite Mineral Data

Berzeliite Mineral Data +

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General Berzeliite Information

Chemical Formula:

(Ca,Na)3(Mg,Mn)2(AsO4)3

Composition:

Molecular Weight = 588.10 gm

Sodium 2.93 % Na 3.95 % Na₂O

Calcium 15.33 % Ca 21.45 % CaO

Magnesium 6.20 % Mg 10.28 % MgO

Manganese 4.67 % Mn 6.03 % MnO

Arsenic 38.22 % As 58.62 % As₂O₅

Oxygen 32.65 % O

______ ______

100.00 % 100.34 % = TOTAL OXIDE

Empirical Formula:

Ca_2.25Na_0.75Mg_1.5Mn²⁺_0.5(AsO₄)₃

Environment:

In metamorphosed Fe-Mn orebodies.

IMA Status:

Valid Species (Pre-IMA) 1840

Locality:

In Sweden, found at Langban and Nordmark, Varmland, and in the Sjo mine, near Grythyttan, Orebro. Link to MinDat.org Location Data.

Name Origin:

In honor of the noted Swedish chemist and mineralogist, Jons Jacob Berzelius (1779-1848).

Synonym:

ICSD 27682

PDF 19-165

Berzeliite Image

Images:

Berzeliite

Comments: White calcite with included grains of yellowish-orange berzeliite in matrix.
Location: Langban, Filipstad, Varmland, Sweden. Scale: 3 x 2.2 cm.
© John Veevaert

Berzeliite Crystallography

Cell Dimensions:

a = 12.405, Z = 8; V = 1,908.93 Den(Calc)= 4.09

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d

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

By Intensity(I/I_o): 2.75(1), 1.65(0.7), 1.71(0.7),

Forms:

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Crystal Structure:

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Hawthorne F C , Acta Crystallographica, Section B , 32 (1976) p.1581-1583, Refinement of the crystal structure of berzeliite, Note: garnet structure, Locality: Langban, Sweden

Physical Properties of Berzeliite

Cleavage:

None

Color:

Orange, Sulfur yellow.

Density:

4.08

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

4.5-5 - Near Apatite

Luster:

Resinous

Streak:

white

Optical Properties of Berzeliite

Gladstone-Dale:

CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1736,KPDmeas= 0.174,KC= 0.18

Optical Data:

Isotropic, n=1.71.

Calculated Properties of Berzeliite

Electron Density:

r_electron=3.87 gm/cc
note: r_Berzeliite=4.08 gm/cc.

Fermion Index

Fermion Index = 0.00656
Boson Index = 0.99344

Photoelectric:

PE_Berzeliite= 29.48 barns/electron
U=PE_Berzeliite x r_electron= 114.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Berzeliite is Not Radioactive

Berzeliite Classification

Dana Class:

38.2.1.1 (38)Anhydrous Phosphates, etc

(38.2)(A+ B++)5 (XO4)3

(38.2.1)Dana Group

38.2.1.1 Berzeliite (Ca,Na)3(Mg,Mn)2(AsO4)3 I a3d 4/m 3 2/m

38.2.1.2 Manganberzeliite (Ca,Na)3(Mn,Mg)2(AsO4)3 I a3d 4/m 3 2/m

38.2.1.3 Palenzonaite (Ca,Na)3Mn(V,As,Si)3O12 I a3d 4/m 3 2/m

38.2.1.4 Schaferite! NaCa2Mg2(VO4)3 I a3d 4/m 3 2/m

Strunz Class:

VII/A.08-30 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of medium and big size: Mg, Mn,Fe, Cu, Zn, and Ca, Na

VII/A.08 - Chladniite - Berzeliite - Palenzonaite series

VII/A.08-03 Galileiite! NaFe4(PO4)3 R 3 3

VII/A.08-05 Chladniite Na2Ca(Mg,Fe)7(PO4)6 R 3 3

VII/A.08-10 Johnsomervilleite Na2Ca(Mg,Fe,Mn)7(PO4)6 R 3 3

VII/A.08-20 Fillowite Na2Ca(Mn,Fe)7(PO4)6 R 3 3

VII/A.08-30 Berzeliite (Ca,Na)3(Mg,Mn)2(AsO4)3 I a3d 4/m 3 2/m

VII/A.08-40 Manganberzeliite (Ca,Na)3(Mn,Mg)2(AsO4)3 I a3d 4/m 3 2/m

VII/A.08-45 Schaferite! NaCa2Mg2(VO4)3 I a3d 4/m 3 2/m

VII/A.08-50 Palenzonaite (Ca,Na)3Mn(V,As,Si)3O12 I a3d 4/m 3 2/m

Other Berzeliite Information

References:

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

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Berzeliite

(Ca,Na)3(Mg,Mn)2(AsO4)3
Dana No: 38.2.1.1 Strunz No: VII/A.08-30
Locality:

Notes: