Normandite Mineral Data
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 % Na2 O
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 % Nb2 O5
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+ 0.75 Fe2+ 0.25 Ti0.6 Nb0.3 Zr0.1 (Si2 O7 )O1.5 F0.5
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.
Name Pronunciation:
Normandite + Pronunciation
Synonym:
ICSD 89860
IMA1990-021
PDF 51-1537
Normandite Image
Images:
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 - Prismatic H-M Symbol (2/m) Space Group: P 21 /a
X Ray Diffraction:
By Intensity(I/Io ): 2.859(1), 2.807(0.7), 3.234(0.3),
Physical Properties of Normandite
Cleavage:
{100} Distinct, {001} Distinct
Color:
Yellow, Orange brown, Orange.
Density:
3.48 - 3.5, Average = 3.49
Diaphaneity:
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 Ncalc = 1.8 - 1.83
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:
Bulk Density (Electron Density)=3.37 gm/cc note: Specific Gravity of Normandite =3.49 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PENormandite = 20.77 barns/electronU=PENormandite x r Electron Density= 70.01 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Normandite is Not Radioactive
Normandite Classification
Dana Class:
56.02.06a.02 (56) Sorosilicate Si2O7 Groups and O, OH, F. and H2O
(56.02) with cations in [4] and/or >[4] coordination
(56.02.06a) Seidozerite - Lamprophyllite group
56.02.06a.01 Seidozerite (Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2 P 2/c 2/m
56.02.06a.02 Normandite ! NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 21 /a 2/m
56.02.06a.03 Grenmarite ! (Zr,Mn)2(Zr,Ti)(Mn,Na)(Na,Ca)4(Si2O7)2(O,F)4 P 2/c 2/m
Strunz Class:
09.BE.17 09 - SILICATES (Germanates)
09.B - Sorosilicates
09.BE -Si2O7 groups with additional anions;
09.BE.17 Baghdadite Ca3(Zr,Ti)Si2O9 P 21 /a 2/m
09.BE.17 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21 /n 2/m
09.BE.17 Burpalite Na2CaZrSi2O7F2 P 21 /a 2/m
09.BE.17 Cuspidine Ca4Si2O7(F,OH)2 P 21 /c 2/m
09.BE.17 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1
09.BE.17 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21 /a 2/m
09.BE.17 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
09.BE.17 Normandite ! NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 21 /a 2/m
09.BE.17 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21 /m 2/m
09.BE.17 Marianoite ! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 21 2/m
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 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Normandite
NaCa(Mn++,Fe++)(Ti,Nb,Zr)Si2O7(O,F)2
Dana No: 56.02.06a.02 Strunz No: 09.BE.17
Locality:
Notes:
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