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General Nacrite Information |
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 Chemical Formula: |
Al2Si2O5(OH)4 | ||
| Composition: |
Molecular Weight = 258.16 gm | ||
| Aluminum 20.90 % Al 39.50 % Al2O3 | |||
| Silicon 21.76 % Si 46.55 % SiO2 | |||
| Hydrogen 1.56 % H 13.96 % H2O | |||
| Oxygen 55.78 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Al2Si2O5(OH)4 | ||
| Environment: |
May be the same as kaolinite or dickite. Hydrothermal origin. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1807 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
| Name Origin: |
From the French, nacre, "mother-of-pearl." | ||
| Name Pronunciation: |
Nacrite  |
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Nacrite Image | |||
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Images:
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Nacrite Crystallography |
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| Axial Ratios: |
a:b:c =1.7312:1:3.0503 | ||
| Cell Dimensions: |
a = 8.909, b = 5.146, c = 15.697, Z = 4; beta = 113.7° V = 658.95 Den(Calc)= 2.60 | ||
| Crystal System: |
Monoclinic - DomaticH-M Symbol (m) Space Group: Cc | ||
| X Ray Diffraction: |
By Intensity(I/Io): 7.187(1), 3.593(0.53), 4.383(0.39), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Nacrite |
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| Cleavage: |
{001} Perfect | ||
| Color: |
Colorless, White, Yellowish, Brownish. | ||
| Density: |
2.6 | ||
| Diaphaneity: |
Transparent | ||
| Fracture: |
Earthy - Dull, clay-like fractures with no visible crystalline affinities, (e.g. howlite). | ||
| Habit: |
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). | ||
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. | ||
| Habit: |
Scaly - Morphology like fish scales. | ||
| Hardness: |
1 - Talc | ||
| Luster: |
Pearly | ||
| Streak: |
white | ||
Optical Properties of Nacrite |
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| Gladstone-Dale: |
CI meas= 0.046 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2156,KPDmeas= 0.2156,KC= 0.226 Ncalc = 1.59 |
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| Optical Data: |
Biaxial (-), a=1.557, b=1.562, g=1.563, bire=0.0060, 2V(Calc)=48, 2V(Meas)=40. | ||
Calculated Properties of Nacrite |
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| Electron Density: |
Bulk Density (Electron Density)=2.62 gm/cc note: Specific Gravity of Nacrite =2.60 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
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| Photoelectric: |
PENacrite = 1.48 barns/electron U=PENacrite x rElectron Density= 3.87 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Nacrite is Not Radioactive |
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Nacrite Classification |
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| Dana Class: |
71.01.01.03 (71)Phyllosilicate Sheets of Six-Membered Rings | ||
| (71.01)with 1:1 layers | |||
| (71.01.01)Kaolinite group | |||
| Strunz Class: |
09.ED.05 09 - SILICATES (Germanates) | ||
| 09.E - Phyllosilicates | |||
| 09.ED -Phyllosilicates with kaolinite layers | |||
Other Nacrite Information |
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| References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Nacrite : 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 15 - WWW-MINCRYST Search for Nacrite using: Visit our Advertisers for Nacrite : A Bijoux Google Search for NacriteAdam's Minerals Google Search for Nacrite Cape Minerals Google Search for Nacrite Dakota Matrix Minerals Google Search for Nacrite Excalibur Mineral Corp. Google Search for Nacrite Exceptional Minerals Google Search for Nacrite John Betts Fine Minerals Search for Nacrite McDougall Minerals Google Search for Nacrite Mineral News Website Link Rock and Mineral Shows Google Search for Nacrite Weinrich Minerals, Inc. Google Search for Nacrite Ask about Nacrite here : Print or Cut-and-Paste your Nacrite Specimen Label here :
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