Norbergite Mineral Data

General Norbergite Information

Chemical Formula:

Mg3(SiO4)(F,OH)2

Composition:

Molecular Weight = 202.00 gm

Magnesium 36.10 % Mg 59.86 % MgO

Silicon 13.90 % Si 29.74 % SiO₂

Hydrogen 0.25 % H 2.23 % H₂O

Oxygen 35.64 % O

Fluorine 14.11 % F 14.11 % F

- % F -5.94 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₃(SiO₄)F_1.5(OH)_0.5

IMA Status:

Valid Species (Pre-IMA) 1926

Locality:

Ostanmosoa iron mine, Norberg, Vastmanland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Norbergite + Pronunciation

Synonym:

ICSD 15203

PDF 11-686

Norbergite Image

Images:

Norbergite

Comments: Numerous orange to orange-brown dipyramidal crystals of norbergite in white matrix.
Location: Piukkala, Near Pargas, Finland. Scale: 2.1 X 2.7 cm.
© John Veevaert

Images:

Norbergite

Comments: Yellow orange norbergite inclustions in white marble (calcite)..
Location: Oakssaung Hill, Mogok, Mandalay Myanmar. Scale: Crystal size 5 mm.
© Fabre Minerals

Norbergite Crystallography

Axial Ratios:

a:b:c =1.8553:1:2.1702

Cell Dimensions:

a = 8.72, b = 4.7, c = 10.2, Z = 4; V = 418.04 Den(Calc)= 3.21

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 3.058(1), 2.23(0.8), 2.639(0.75),

Physical Properties of Norbergite

Cleavage:

{???} Distinct

Color:

White, Yellow, Brown, Red.

Density:

3.1 - 3.2, Average = 3.15

Diaphaneity:

Transparent to translucent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luminescence:

Fluorescent, Short UV=bright yellow.

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Norbergite

Gladstone-Dale:

CI meas= 0.07 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.088 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1786,KPDmeas= 0.182,KC= 0.1958
Ncalc = 1.61 - 1.63

Optical Data:

Biaxial (+), a=1.563, b=1.567, g=1.59, bire=0.0270

Calculated Properties of Norbergite

Electron Density:

Bulk Density (Electron Density)=3.12 gm/cc
note: Specific Gravity of Norbergite =3.15 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Norbergite= 1.41 barns/electron
U=PE_Norbergite x rElectron Density= 4.40 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Norbergite is Not Radioactive

Norbergite Classification

Dana Class:

52.03.02a.01 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.03)with cations in [6] coordination only

(52.03.02a)Humite group

52.03.02a.01 Norbergite Mg3(SiO4)(F,OH)2 P nma 2/m 2/m 2/m

Strunz Class:

09.AF.40 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AF -Nesosilicates with additional anions;

09.AF.40 Norbergite Mg3(SiO4)(F,OH)2 P nma 2/m 2/m 2/m

Other Norbergite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;Dana8) OPTIC PROP.(Ford32)

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Print or Cut-and-Paste your Norbergite Specimen Label here :

Norbergite

Mg3(SiO4)(F,OH)2
Dana No: 52.03.02a.01 Strunz No: 09.AF.40
Locality:

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