Swinefordite Mineral Data

Swinefordite Mineral Data +

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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.

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

Diaphaniety:

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

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:

r_electron=2.56 gm/cc
note: r_Swinefordite=2.55 gm/cc.

Fermion Index

Fermion Index = 0.0146
Boson Index = 0.9854

Photoelectric:

PE_Swinefordite= 1.88 barns/electron
U=PE_Swinefordite x r_electron= 4.82 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Swinefordite is Not Radioactive

Swinefordite Classification

Dana Class:

71.3.1a.5 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.3)with 2:1 clays

(71.3.1a)Smectite group (Dioctahedral Smectites)

71.3.1a.1 Beidellite Na0.5Al2(Si3.5Al0.5)O10(OH)2·n(H2O) C 2/m or ORTH 2/m

71.3.1a.2 Montmorillonite (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2·n(H2O) C 2/m 2/m

71.3.1a.3 Nontronite Na0.3Fe2(Si,Al)4O10(OH)2·n(H2O) C 2/m 2/m

71.3.1a.4 Volkonskoite Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

71.3.1a.5 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:

VIII/H.19-60 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.19 - Brammallite ? - Yakhontovite series

VIII/H.19-10 Brammallite* (Na,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] C 2/c 2/m

VIII/H.19-10a Brinrobertsite! (Na,K,Ca)x(Al,Fe,Mg)4(Si,Al)8O20(OH)4·3.54(H2O)[x=0.35,n=3.54] pseudo 2/m 2/m

VIII/H.19-15 Illite* (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] C 2/m 2/m

VIII/H.19-20 Montmorillonite (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2·n(H2O) C 2/m 2/m

VIII/H.19-30 Beidellite Na0.5Al2(Si3.5Al0.5)O10(OH)2·n(H2O) C 2/m or ORTH 2/m

VIII/H.19-40 Nontronite Na0.3Fe2(Si,Al)4O10(OH)2·n(H2O) C 2/m 2/m

VIII/H.19-50 Volkonskoite Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

VIII/H.19-60 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

VIII/H.19-70 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2·3(H2O) C 2/m 2/m

Other Swinefordite Information

References:

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

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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: 71.3.1a.5 Strunz No: VIII/H.19-60
Locality:

Notes: