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General Dickite 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 | ||
| IMA Status: |
Valid Species (Pre-IMA) 1930 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
| Name Origin: |
Named after the Scottish chemist, A. B. Dick. | ||
| Name Pronunciation: |
Dickite  |
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Dickite Image | |||
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Images:
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Images:
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Dickite Crystallography |
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| Axial Ratios: |
a:b:c =0.576:1:1.6135 | ||
| Cell Dimensions: |
a = 5.1375, b = 8.9178, c = 14.389, Z = 4; beta = 96.74° V = 654.68 Den(Calc)= 2.62 | ||
| Crystal System: |
Monoclinic - DomaticH-M Symbol (m) Space Group: Cc | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.58(1), 7.15(1), 2.33(0.9), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Dickite |
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| Cleavage: |
{001} Perfect | ||
| Color: |
Blue, Colorless, Gray, Yellow brown, White. | ||
| Density: |
2.6 | ||
| Diaphaneity: |
Subtranslucent to opaque | ||
| 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). | ||
| Hardness: |
1.5-2 - Talc-Gypsum | ||
| Luster: |
Pearly | ||
| Streak: |
white | ||
Optical Properties of Dickite |
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| Gladstone-Dale: |
CI meas= 0.042 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.049 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2149,KPDmeas= 0.2166,KC= 0.226 Ncalc = 1.59 |
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| Optical Data: |
Biaxial (+), a=1.558-1.562, b=1.56-1.565, g=1.563-1.571, bire=0.0050-0.0090, 2V(Calc)=72-80, 2V(Meas)=52-80. Dispersion none. | ||
| Pleochroism (x): |
colorless. | ||
| Pleochroism (y): |
colorless. | ||
| Pleochroism (z): |
colorless. | ||
Calculated Properties of Dickite |
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| Electron Density: |
Bulk Density (Electron Density)=2.62 gm/cc note: Specific Gravity of Dickite =2.60 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
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| Photoelectric: |
PEDickite = 1.48 barns/electron U=PEDickite x rElectron Density= 3.87 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Dickite is Not Radioactive |
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Dickite Classification |
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| Dana Class: |
71.01.01.01 (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 Dickite Information |
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| References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) | ||
| See Also: |
Links to other databases for Dickite : 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 Dickite using: Visit our Advertisers for Dickite : A Bijoux Google Search for DickiteAdam's Minerals Google Search for Dickite Cape Minerals Google Search for Dickite Dakota Matrix Minerals Google Search for Dickite Excalibur Mineral Corp. Google Search for Dickite Exceptional Minerals Google Search for Dickite John Betts Fine Minerals Search for Dickite McDougall Minerals Google Search for Dickite Mineral News Website Link Rock and Mineral Shows Google Search for Dickite Weinrich Minerals, Inc. Google Search for Dickite Ask about Dickite here : Print or Cut-and-Paste your Dickite Specimen Label here :
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