Polylithionite Mineral Data

Polylithionite Mineral Data +

General Polylithionite Information

Chemical Formula:

KLi2AlSi4O10(F,OH)2

Composition:

Molecular Weight = 393.12 gm

Potassium 9.95 % K 11.98 % K₂O

Sodium 1.75 % Na 2.36 % Na₂O

Lithium 3.00 % Li 6.46 % Li₂O

Aluminum 6.86 % Al 12.97 % Al₂O₃

Silicon 28.58 % Si 61.14 % SiO₂

Hydrogen 0.26 % H 2.29 % H₂O

Oxygen 44.77 % O

Fluorine 4.83 % F 4.83 % F

- % F -2.03 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KLi_1.7Na_0.3AlSi₄O₁₀F(OH)

Environment:

In syenite pegmatites in differentiated alkalic rocks.

IMA Status:

Valid Species (Pre-IMA) 1884

Locality:

Ilimaussaq intrusion, southern Greenland. Link to MinDat.org Location Data.

Name Origin:

From the Greek "ploy" for many or much, and in allusion to its high LITHIum content.

Synonym:

ICSD 34336 (with F)

PDF 21952

Polylithionite Image

Images:

Polylithionite

Comments: Rosette of polylithionite crystals.
Location: Mt. St. Hilaire, Quebec, Canada. Scale: 2.5 x 2.3 cm.
© John Veevaert

Images:

Polylithionite Shibkovite

Comments: Clear crystalline shibkovite aggregates with peach colored translucent polylithionite.
Location: Dara-Pioz, Tien-Shan, Tadzhikistan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Polylithionite Crystallography

Axial Ratios:

a:b:c =0.5782:1:1.1183

Cell Dimensions:

a = 5.186, b = 8.968, c = 10.029, Z = 2; beta = 100.4° V = 458.77 Den(Calc)= 2.85

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.07(1), 3.31(1), 3.59(1),

Crystal Structure:

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Brigatti M F , Lugli C , Poppi L , Foord E E , Kile D E , American Mineralogist , 85 (2000) p.1275-1286, Crystal chemical variations in Li- and Fe-rich micas from, Pikes Peak batholith (central Colorado), Sample: 114

View Additional jPOWD Structure files for Polylithionite
[1] [10] [11] [12] [2] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Polylithionite

Cleavage:

[001] Perfect

Color:

Bluish, Colorless, Violet, Greenish, Pearl white.

Density:

2.58 - 2.82, Average = 2.7

Diaphaniety:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Habit:

Scaly - Morphology like fish scales.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2-3 - Gypsum-Calcite

Luminescence:

Fluorescent, Short UV=lemon yellow.

Luster:

Pearly

Streak:

white

Optical Properties of Polylithionite

Gladstone-Dale:

CI meas= 0.044 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.094 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1919,KPDmeas= 0.2025,KC= 0.2119

Optical Data:

Biaxial (-), a=1.53, b=1.551-1.556, g=1.555-1.559, bire=0.0250-0.0290

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Polylithionite

Electron Density:

r_electron=2.67 gm/cc
note: r_{Polylithionite}=2.70 gm/cc.

Fermion Index

Fermion Index = 0.01582
Boson Index = 0.98418

Photoelectric:

PE_{Polylithionite}= 2.37 barns/electron
U=PE_{Polylithionite} x r_electron= 6.33 barns/cc.

Radioactivity:

GRapi = 141.95 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Polylithionite - barely detectable

Polylithionite Classification

Dana Class:

71.2.2b.8 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.2b)Mica Group (Biotite subgroup)

71.2.2b.1 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

71.2.2b.1a Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m

71.2.2b.1b Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

71.2.2b.2 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m

71.2.2b.3 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

71.2.2b.3a Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

71.2.2b.4 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

71.2.2b.5 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

71.2.2b.5a Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

71.2.2b.6 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

71.2.2b.7 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono

71.2.2b.8 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

71.2.2b.8a Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

71.2.2b.8b Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono

71.2.2b.9 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

71.2.2b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

71.2.2b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

71.2.2b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

71.2.2b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

71.2.2b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m

71.2.2b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

71.2.2b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

71.2.2b.17 IMA2004-049! NaMg3(AlSi3)O10(OH)2 C 2/m 2/m

Strunz Class:

VIII/H.11-10 VIII - Silicates

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

VIII/H.11 - Mica group, Biotite series

VIII/H.11-00* Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

VIII/H.11-10 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

VIII/H.11-20 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

VIII/H.11-30 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

VIII/H.11-35 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m

VIII/H.11-40 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

VIII/H.11-50 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

VIII/H.11-60 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

VIII/H.11-70 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

VIII/H.11-80 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

VIII/H.11-90 Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m

VIII/H.11-100 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

VIII/H.11-102 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

VIII/H.11-105 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

VIII/H.11-110 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

VIII/H.11-120 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

VIII/H.11-130 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

VIII/H.11-140 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

VIII/H.11-150 Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

VIII/H.11-160 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

Other Polylithionite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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Polylithionite

KLi2AlSi4O10(F,OH)2
Dana No: 71.2.2b.8 Strunz No: VIII/H.11-10
Locality:

Notes: