Swinefordite Mineral Data

General Swinefordite Information

Chemical Formula:

(Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2•2(H2O)

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

Empirical Formula:

LiCa_0.5Na_0.1Al_1.5Mg_0.5Si₃O₁₀(OH)_1.5F_0.5•2(H₂O)

IMA Status:

Approved IMA 1975

Locality:

Foote Quarry, Kings Mountain, Cleveland County, North Carolina, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Ada Swineford (1917-1993), clay mineralogist and professor of geology at Western Washington State College, Bellingham, Washinton, USA.

Name Pronunciation:

Swinefordite + Pronunciation

Swinefordite Image

Images:

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

Axial Ratios:

a:b:c =0.5777:1:1.4444

Cell Dimensions:

a = 5.2, b = 9, c = 13, Z = 2; beta = 90° V = 608.40 Den(Calc)= 2.17

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/I_o): 12.96(1), 1.508(0.9), 4.53(0.9),

Physical Properties of Swinefordite

Cleavage:

{001} Perfect

Color:

Greenish gray, Light olive green.

Density:

2.3 - 2.8, Average = 2.54

Diaphaneity:

Translucent to Opaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

1 - Talc

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Swinefordite

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

Optical Data:

Biaxial (-), a=1.492, b=1.524, g=1.526, bire=0.0340, 2V(Calc)=26, 2V(Meas)=29-45.

Pleochroism (y):

colorless.

Pleochroism (z):

light yellowish brown.

Calculated Properties of Swinefordite

Electron Density:

Bulk Density (Electron Density)=2.56 gm/cc
note: Specific Gravity of Swinefordite =2.55 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Swinefordite= 1.88 barns/electron
U=PE_Swinefordite x rElectron Density= 4.82 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Swinefordite is Not Radioactive

Swinefordite Classification

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

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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:

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