Mineralogy Database

Swinefordite Mineral Data

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General Swinefordite Information

Help on Chemical  Formula: Chemical Formula: (Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2•2(H2O)
Help on Composition: Composition: Molecular Weight = 397.20 gm
   Sodium      0.58 %  Na    0.78 % Na2O
   Lithium     1.75 %  Li    3.76 % Li2O
   Calcium     5.05 %  Ca    7.06 % CaO
   Magnesium   3.06 %  Mg    5.07 % MgO
   Aluminum   10.19 %  Al   19.25 % Al2O3
   Silicon    21.21 %  Si   45.38 % SiO2
   Hydrogen    1.40 %  H    12.47 % H2O
   Oxygen     54.38 %  O
   Fluorine    2.39 %  F     2.39 % F
                -   %   F    -1.01 % -O=F2    
             ______        ______ 
             100.00 %       95.17 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: LiCa0.5Na0.1Al1.5Mg0.5Si3O10(OH)1.5F0.5•2(H2O)
Help on IMA Status: IMA Status: Approved IMA 1975
Help on Locality: Locality: Foote Quarry, Kings Mountain, Cleveland County, North Carolina, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ada Swineford (1917-1993), clay mineralogist and professor of geology at Western Washington State College, Bellingham, Washinton, USA.
Help on Name Pronunciation: Name Pronunciation: Swinefordite + Pronunciation Say SWINEFORDITE
 

Swinefordite Image

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  Swinefordite

Comments: Dark green leathery swinefordite coating on pegmatite.
Location: Foote Mine, King's Mountain, Cleveland County, North Carolina, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Swinefordite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5777:1:1.4444
Help on Cell Dimensions: Cell Dimensions: a = 5.2, b = 9, c = 13, Z = 2; beta = 90° V = 608.40 Den(Calc)= 2.17
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m (MON or ORTH)
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.96(1), 1.508(0.9), 4.53(0.9),
 

Physical Properties of Swinefordite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Greenish gray, Light olive green.
Help on Density: Density: 2.3 - 2.8, Average = 2.54
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Hardness: Hardness: 1 - Talc
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white
 

Optical Properties of Swinefordite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.066 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2369,KPDmeas= 0.2016,KC= 0.2158
Ncalc = 1.47 - 1.6
Help on Optical Data: Optical Data: Biaxial (-), a=1.492, b=1.524, g=1.526, bire=0.0340, 2V(Calc)=26, 2V(Meas)=29-45.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): light yellowish brown.
 

Calculated Properties of Swinefordite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.56 gm/cc
note: Specific Gravity of Swinefordite =2.55 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PESwinefordite = 1.88 barns/electron
U=PESwinefordite x rElectron Density= 4.82 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Swinefordite is Not Radioactive
 

Swinefordite Classification

Help on  Dana Class: Dana Class: 71.03.01a.05 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.03)with 2:1 clays
  (71.03.01a)Smectite group (Dioctahedral Smectites)
 
71.03.01a.01 Beidellite Na0.5Al2(Si3.5Al0.5)O10(OH)2•n(H2O) C 2/m or ORTH 2/m
 
71.03.01a.02 Montmorillonite (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2•n(H2O) C 2/m 2/m
 
71.03.01a.03 Nontronite Na0.3Fe2(Si,Al)4O10(OH)2•n(H2O) C 2/m 2/m
 
71.03.01a.04 Volkonskoite Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
 
71.03.01a.05 Swinefordite (Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2•2(H2O) C 2/m (MON or ORTH) 2/m
Help on  Strunz Class: Strunz Class: 09.EC.45 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
 
09.EC.45 Griffithite* 4(Mg,Fe,Ca)O.(Al,Fe)2O3.5SiO2•7(H2O) Mono
 
09.EC.45 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m
 
09.EC.45 Swinefordite (Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2•2(H2O) C 2/m (MON or ORTH) 2/m
 
09.EC.45 Zincsilite Zn3Si4O10(OH)2•4(H2O)(?) C 2/m ? 2/m
 
09.EC.45 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
 
09.EC.45 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
 
09.EC.45 Spadaite MgSiO2(OH)2•(H2O)(?) Ortho
 
09.EC.45 Sobotkite? (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2•1-5(H2O) Unk. Mono
 
09.EC.45 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2•n(H2O) Unk (ORTH ?) Mono
 
09.EC.45 Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C? Mono
 

Other Swinefordite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Swinefordite :
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

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Swinefordite

(Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2•2(H2O)
Dana No: 71.03.01a.05 Strunz No: 09.EC.45
Locality:

 

Notes:

 

 
   
 


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