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Loudounite Mineral Data
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General Loudounite Information
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 Chemical Formula: |
NaCa5Zr4Si16O40(OH)11•8(H2O) |
| Composition: |
Molecular Weight = 2,008.82 gm |
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Sodium 1.14 % Na 1.54 % Na2O |
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Calcium 9.98 % Ca 13.96 % CaO |
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Zirconium 18.16 % Zr 24.54 % ZrO2 |
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Silicon 22.37 % Si 47.86 % SiO2 |
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Hydrogen 1.35 % H 12.11 % H2O |
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Oxygen 46.99 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
NaCa5Zr4Si16O40(OH)11•8(H2O) |
| Environment: |
In a diabase. |
| IMA Status: |
Approved IMA 1983 |
| Locality: |
Goose Creek Quarry, Loudoun Co., Virginia, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Loudounite + Pronunciation  |
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Loudounite Image |
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Images:
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Loudounite
Comments: SEM image of several spherulitic aggregates of loudounite with acicular actinolite. AmMin, 21:37.
Location: Goose Creek quarry, Loudoun County, Virginia, USA.
Scale: Scale Bar 50 µm.
© American Mineralogist |
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Loudounite Crystallography
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| Crystal System: |
Monoclinic |
| X Ray Diffraction: |
By Intensity(I/Io): 2.931(1), 4.06(0.7), 7.37(0.6), |
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Physical Properties of Loudounite
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| Color: |
Colorless, Green, White, Light green. |
| Density: |
2.48 |
| Diaphaneity: |
Translucent |
| Habit: |
Fibrous - Crystals made up of fibers. |
| Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
| Habit: |
Spherical - Spherical, rounded aggregates. |
| Hardness: |
5 - Apatite |
| Luminescence: |
Non-fluorescent. |
| Streak: |
white |
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Optical Properties of Loudounite
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| Gladstone-Dale: |
CI meas= 0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.219,KC= 0.2247
Ncalc = 1.56 |
| Optical Data: |
Biaxial (?), a=1.536, g=1.55, bire=0.0140 |
| Pleochroism (x): |
none. |
| Pleochroism (y): |
none. |
| Pleochroism (z): |
none. |
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Calculated Properties of Loudounite
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| Electron Density: |
Bulk Density (Electron Density)=2.45 gm/cc
note: Specific Gravity of Loudounite =2.48 gm/cc.
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| Fermion Index: |
Fermion Index = 0.03
Boson Index = 0.97 |
| Photoelectric: |
PELoudounite = 25.75 barns/electron
U=PELoudounite x rElectron Density= 63.20 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Loudounite is Not Radioactive |
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Loudounite Classification
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| Dana Class: |
59.02.02.05 (59)Cyclosilicate Three-Membered Rings |
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(59.02)hydrated |
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(59.02.02)Catapleiite group |
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59.02.02.01 Catapleiite (Na,Ca,[])2ZrSi3O9•2(H2O) B2/b (pseudo-HEX) 2/m |
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59.02.02.02 Calciocatapleiite (Ca,[])ZrSi3O9•2(H2O) Pbnn 2/m 2/m 2/m |
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59.02.02.03 Gaidonnayite Na2ZrSi3O9•2(H2O) P 21nb mm2 |
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59.02.02.04 Georgechaoite KNaZrSi3O9•2(H2O) P 21nb mm2 |
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59.02.02.05 Loudounite NaCa5Zr4Si16O40(OH)11•8(H2O) Mono |
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59.02.02.06 Bobtraillite! (Na,Ca)13Sr11(Zr,Y,Nb)14Si42B6O132(OH)12•12H2O P 3c1 3 2/m |
| Strunz Class: |
09.HF.10 09 - SILICATES (Germanates) |
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09.H - Unclassified Silicates |
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09.HF -With Nb, Ta, Zr |
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09.HF.10 Loudounite NaCa5Zr4Si16O40(OH)11•8(H2O) Mono |
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Other Loudounite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Loudounite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Loudounite
NaCa5Zr4Si16O40(OH)11•8(H2O)
Dana No: 59.02.02.05 Strunz No: 09.HF.10
Locality:
Notes:
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