Mineralogy Database

Dickite Mineral Data

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General Dickite Information

Help on Chemical  Formula: Chemical Formula: Al2Si2O5(OH)4
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Al2Si2O5(OH)4
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1930
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Scottish chemist, A. B. Dick.
Help on Name Pronunciation: Name Pronunciation: Dickite Say DICKITE
 

Dickite Image

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  Ankerite   Sphalerite   Dickite

Comments: White, rhombohedral crystals of ankerite and dark gray, metallic sphalerite on beige dickite.
Location: Prego mine, Kladno, Czech Rebublic. Scale: Picture size 2 cm.
© Dave Barthelmy

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  Dickite

Comments: Porcelaneous pure white massive dickite.
Location: Beaver County, Utah, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dickite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.576:1:1.6135
Help on Cell Dimensions: Cell Dimensions: a = 5.1375, b = 8.9178, c = 14.389, Z = 4; beta = 96.74° V = 654.68 Den(Calc)= 2.62
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.58(1), 7.15(1), 2.33(0.9),
 

Physical Properties of Dickite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Blue, Colorless, Gray, Yellow brown, White.
Help on Density: Density: 2.6
Help on Diaphaneity: Diaphaneity: Subtranslucent to opaque
Help on Fracture: Fracture: Earthy - Dull, clay-like fractures with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Pearly
Help on Streak: Streak: white
 

Optical Properties of Dickite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Dickite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.62 gm/cc
note: Specific Gravity of Dickite =2.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEDickite = 1.48 barns/electron
U=PEDickite x rElectron Density= 3.87 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dickite is Not Radioactive
 

Dickite Classification

Help on  Dana Class: Dana Class: 71.01.01.01 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.01)with 1:1 layers
  (71.01.01)Kaolinite group
 
71.01.01.01 Dickite Al2Si2O5(OH)4 Cc m
 
71.01.01.02 Kaolinite Al2Si2O5(OH)4 P1 1
 
71.01.01.03 Nacrite Al2Si2O5(OH)4 Cc m
 
71.01.01.04 Halloysite Al2Si2O5(OH)4 Cc m
 
71.01.01.04a Endellite? Al2Si2O5(OH)4•2(H2O) Cc m
 
71.01.01.05 Odinite (Fe,Mg,Al,Fe,Ti,Mn)2.5(Si,Al)2O5(OH)4 Cm m
Help on  Strunz Class: Strunz Class: 09.ED.05 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.ED -Phyllosilicates with kaolinite layers
 
09.ED.05 Dickite Al2Si2O5(OH)4 Cc m
 
09.ED.05 Kaolinite Al2Si2O5(OH)4 P1 1
 
09.ED.05 Nacrite Al2Si2O5(OH)4 Cc m
 

Other Dickite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: 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

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Print or Cut-and-Paste your Dickite Specimen Label here :

Dickite

Al2Si2O5(OH)4
Dana No: 71.01.01.01 Strunz No: 09.ED.05
Locality:

 

Notes:

 

 
   
 


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