Normandite Mineral Data

Normandite Mineral Data +

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General Normandite Information

Chemical Formula:

NaCa(Mn++,Fe++)(Ti,Nb,Zr)Si2O7(O,F)2

Composition:

Molecular Weight = 385.62 gm

Sodium 5.96 % Na 8.04 % Na₂O

Calcium 10.39 % Ca 14.54 % CaO

Zirconium 2.37 % Zr 3.20 % ZrO₂

Titanium 7.45 % Ti 12.43 % TiO₂

Manganese 10.68 % Mn 13.80 % MnO

Niobium 7.23 % Nb 10.34 % Nb₂O₅

Iron 3.62 % Fe 4.66 % FeO

Silicon 14.57 % Si 31.16 % SiO₂

Oxygen 35.27 % O

Fluorine 2.46 % F 2.46 % F

- % F -1.04 % -O=F₂

______ ______

100.00 % 99.59 % = TOTAL OXIDE

Empirical Formula:

NaCaMn²⁺_0.75Fe²⁺_0.25Ti_0.6Nb_0.3Zr_0.1(Si₂O₇)O_1.5F_0.5

Environment:

In miarolitic cavities in nepheline syenite.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

The Prudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

For Mr. Charles Normand (1963-), of Montreal, who discovered the mineral.

Synonym:

ICSD 89860

IMA1990-021

PDF 51-1537

Normandite Image

Images:

Normandite

Comments: Divergent acicular normandite crystals in pegmatite.
Location: Mount Partomchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Normandite Crystallography

Axial Ratios:

a:b:c =1.106:1:0.7205

Cell Dimensions:

a = 10.828, b = 9.79, c = 7.054, Z = 4; beta = 108.2° V = 710.36 Den(Calc)= 3.61

Crystal System:

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

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

By Intensity(I/I_o): 2.859(1), 2.807(0.7), 3.234(0.3),

Crystal Structure:

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Perchiazzi N , McDonald A M , Gault R A , Johnsen O , Merlino S , The Canadian Mineralogist , 38 (2000) p.641-648, The crystal structure of normandite and its crystal-chemical, relationships with lavenite, Locality: Amdrup Fjord

View Additional jPOWD Structure files for Normandite
[1]

Physical Properties of Normandite

Cleavage:

[100] Distinct, [001] Distinct

Color:

Yellow, Orange brown, Orange.

Density:

3.48 - 3.5, Average = 3.49

Diaphaniety:

Transparent to translucent

Fracture:

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

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5-6 - Between Apatite and Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Adamantine

Streak:

pale yellowish white

Optical Properties of Normandite

Gladstone-Dale:

CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2159,KPDmeas= 0.2233,KC= 0.231

Optical Data:

Biaxial (-), a=1.743, b=1.785, g=1.81, bire=0.0670, 2V(Calc)=72, 2V(Meas)=72 -84. Dispersion r > v moderate.

Pleochroism (x):

pale yellow.

Pleochroism (y):

yellow.

Pleochroism (z):

brownish red or deep red.

Calculated Properties of Normandite

Electron Density:

r_electron=3.37 gm/cc
note: r_Normandite=3.49 gm/cc.

Fermion Index

Fermion Index = 0.02016
Boson Index = 0.97984

Photoelectric:

PE_Normandite= 20.77 barns/electron
U=PE_Normandite x r_electron= 70.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Normandite is Not Radioactive

Normandite Classification

Dana Class:

56.2.6a.2 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.2)with cations in [4] and/or >[4] coordination

(56.2.6a)Seidozerite - Lamprophyllite group

56.2.6a.1 Seidozerite (Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2 P 2/c 2/m

56.2.6a.2 Normandite ! NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 2₁/a 2/m

56.2.6a.3 Grenmarite! (Zr,Mn)2(Zr,Ti)(Mn,Na)(Na,Ca)4(Si2O7)2(O,F)4 P 2/c 2/m

Strunz Class:

VIII/C.11-15 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.11 - Wöhlerite - Lavenite series

VIII/C.11-05 Cuspidine Ca4Si2O7(F,OH)2 P 2₁/c 2/m

VIII/C.11-10 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 2₁/m 2/m

VIII/C.11-12 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 2₁/n 2/m

VIII/C.11-15 Normandite NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 2₁/a 2/m

VIII/C.11-20 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 2₁/a 2/m

VIII/C.11-25 Burpalite Na2CaZrSi2O7F2 P 2₁/a 2/m

VIII/C.11-30 Baghdadite Ca3(Zr,Ti)Si2O9 P 2₁/a 2/m

VIII/C.11-40 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m

VIII/C.11-50 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1

Other Normandite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p655,1998) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Normandite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Normandite

NaCa(Mn++,Fe++)(Ti,Nb,Zr)Si2O7(O,F)2
Dana No: 56.2.6a.2 Strunz No: VIII/C.11-15
Locality:

Notes: