Swinefordite Mineral Data

[Current Minerals] [Order Status] [Policies] [e-Bay Items]
B & L Minerals, Fine Mineral specimens for sale for collectors of all levels

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 - PrismaticH-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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Swinefordite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Swinefordite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Swinefordite Mineral Data :

Ask about Swinefordite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Swinefordite Specimen Label here :

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: