Mineralogy Database

Palygorskite Mineral Data

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General Palygorskite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Al)2Si4O10(OH)•4(H2O)
Help on Composition: Composition: Molecular Weight = 411.35 gm
   Magnesium   8.86 %  Mg   14.70 % MgO
   Aluminum    3.28 %  Al    6.20 % Al2O3
   Silicon    27.31 %  Si   58.43 % SiO2
   Hydrogen    2.21 %  H    19.71 % H2O
   Oxygen     58.34 %  O
             ______        ______ 
             100.00 %       99.03 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg1.5Al0.5Si4O10(OH)•4(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1862
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after a deposit in the Ural Mountains, Russia.
Help on Name Pronunciation: Name Pronunciation: Palygorskite + Pronunciation Say PALYGORSKITE
Help on Synonym: Synonym: Attapulgite

Palygorskite Image

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Comments: Compact massive palygorskite.
Location: Senton, Devon, England. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Palygorskite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6892:1:0.2929
Help on Cell Dimensions: Cell Dimensions: a = 12.33, b = 17.89, c = 5.24, Z = 4; beta = 105.2° V = 1,115.42 Den(Calc)= 2.45
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.23(1), 10.5(1), 4.49(0.8),

Physical Properties of Palygorskite

Help on Cleavage: Cleavage: {110} Good
Help on Color: Color: White, Gray, Brownish white.
Help on Density: Density: 2.1 - 2.2, Average = 2.15
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white

Optical Properties of Palygorskite

Help on Optical Data: 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

Calculated Properties of Palygorskite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.50 gm/cc
note: Specific Gravity of Palygorskite =2.45 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEPalygorskite = 1.39 barns/electron
U=PEPalygorskite x rElectron Density= 3.48 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Palygorskite is Not Radioactive

Palygorskite Classification

Help on  Dana Class: Dana Class: 74.03.01a.01 (74)Phyllosilicate Modulated Layers
  (74.03)with joined strips
  (74.03.01a)Palygorskite-sepiolite group (Palygorskite subgroup)
74.03.01a.01 Palygorskite (Mg,Al)2Si4O10(OH)•4(H2O) C 2/m 2/m
74.03.01a.02 Tuperssuatsiaite Na(Fe,Mn)3[Si8O20](OH)2•n(H2O) C 2/m Mono
74.03.01a.03 Yofortierite (Mn,Mg)5Si8O20(OH)2•8-9(H2O) Pn(?) m
74.03.01a.04 Kalifersite! (K,Na)5Fe7Si20O50(OH)6•12(H2O) P1 1
Help on  Strunz Class: Strunz Class: 09.EE.20 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EE -Single tetrahedral nets of 6-membered rings
09.EE.20 Palygorskite (Mg,Al)2Si4O10(OH)•4(H2O) C 2/m 2/m
09.EE.20 Yofortierite (Mn,Mg)5Si8O20(OH)2•8-9(H2O) Pn(?) m
09.EE.20 Tuperssuatsiaite Na(Fe,Mn)3[Si8O20](OH)2•n(H2O) C 2/m Mono

Other Palygorskite Information

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

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Dana No: 74.03.01a.01 Strunz No: 09.EE.20





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