Dickite Mineral Data (original) (raw)

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

Click Here for Larger Dickite Image in a New Browser Window Images:

Click Here for Larger Dickite Image Dickite Ankerite Sphalerite 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 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 - DomaticH-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),

Click Here for Large Dickite Structure Window Crystal Structure:

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Help on Above

| | Bailey S W , American Mineralogist , 48 (1963) p.1196-1209, Polymorphism of the kaolin minerals View Additional jPOWD Structure files for Dickite [1] [2] | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

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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Ask about Dickite here :
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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: