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Palygorskite Mineral Data
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General Palygorskite Information
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 Chemical Formula: |
(Mg,Al)2Si4O10(OH)•4(H2O) |
| Composition: |
Molecular Weight = 411.35 gm |
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Magnesium 8.86 % Mg 14.70 % MgO |
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Aluminum 3.28 % Al 6.20 % Al2O3 |
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Silicon 27.31 % Si 58.43 % SiO2 |
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Hydrogen 2.21 % H 19.71 % H2O |
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Oxygen 58.34 % O |
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______ ______ |
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100.00 % 99.03 % = TOTAL OXIDE |
| Empirical Formula: |
Mg1.5Al0.5Si4O10(OH)•4(H2O) |
| IMA Status: |
Valid Species (Pre-IMA) 1862 |
| Locality: |
Link to MinDat.org Location Data. |
| Name Origin: |
Named after a deposit in the Ural Mountains, Russia. |
| Name Pronunciation: |
Palygorskite + Pronunciation  |
| Synonym: |
Attapulgite |
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Palygorskite Image |
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Images:
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Palygorskite Crystallography
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| Axial Ratios: |
a:b:c =0.6892:1:0.2929 |
| Cell Dimensions: |
a = 12.33, b = 17.89, c = 5.24, Z = 4; beta = 105.2° V = 1,115.42 Den(Calc)= 2.45 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.23(1), 10.5(1), 4.49(0.8), |
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Physical Properties of Palygorskite
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| Cleavage: |
{110} Good |
| Color: |
White, Gray, Brownish white. |
| Density: |
2.1 - 2.2, Average = 2.15 |
| Diaphaneity: |
Translucent |
| Fracture: |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. |
| Habit: |
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). |
| Habit: |
Massive - Fibrous - Distinctly fibrous fine-grained forms. |
| Hardness: |
2-2.5 - Gypsum-Finger Nail |
| Luster: |
Earthy (Dull) |
| Streak: |
white |
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Optical Properties of Palygorskite
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| Optical Data: |
NCalc= 1.57 - from Gladstone-Dale relationship (KC = 0.2308) where Ncalc=Dcalc*KC+1
NCalc= 1.5 - from Gladstone-Dale relationship (KC = 0.2308) where Ncalc=Dmeas*KC+1
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Calculated Properties of Palygorskite
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| Electron Density: |
Bulk Density (Electron Density)=2.50 gm/cc
note: Specific Gravity of Palygorskite =2.45 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PEPalygorskite = 1.39 barns/electron
U=PEPalygorskite x rElectron Density= 3.48 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Palygorskite is Not Radioactive |
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Palygorskite Classification
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| Dana Class: |
74.03.01a.01 (74)Phyllosilicate Modulated Layers |
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(74.03)with joined strips |
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(74.03.01a)Palygorskite-sepiolite group (Palygorskite subgroup) |
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74.03.01a.01 Palygorskite (Mg,Al)2Si4O10(OH)•4(H2O) C 2/m 2/m |
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74.03.01a.02 Tuperssuatsiaite Na(Fe,Mn)3[Si8O20](OH)2•n(H2O) C 2/m Mono |
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74.03.01a.03 Yofortierite (Mn,Mg)5Si8O20(OH)2•8-9(H2O) Pn(?) m |
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74.03.01a.04 Kalifersite! (K,Na)5Fe7Si20O50(OH)6•12(H2O) P1 1 |
| Strunz Class: |
09.EE.20 09 - SILICATES (Germanates) |
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09.E - Phyllosilicates |
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09.EE -Single tetrahedral nets of 6-membered rings |
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09.EE.20 Palygorskite (Mg,Al)2Si4O10(OH)•4(H2O) C 2/m 2/m |
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09.EE.20 Yofortierite (Mn,Mg)5Si8O20(OH)2•8-9(H2O) Pn(?) m |
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09.EE.20 Tuperssuatsiaite Na(Fe,Mn)3[Si8O20](OH)2•n(H2O) C 2/m Mono |
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Other Palygorskite Information
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| References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Palygorskite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Scandinavian mineral gallery
17 - WWW-MINCRYST
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Palygorskite
(Mg,Al)2Si4O10(OH)•4(H2O)
Dana No: 74.03.01a.01 Strunz No: 09.EE.20
Locality:
Notes:
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