Eveslogite Mineral Data

General Eveslogite Information

Chemical Formula:

(Ca,K,Na,Sr,Ba)48[(Ti,Nb,Fe,Mn)12(OH)12Si48O144](F,OH,Cl)14

Composition:

Molecular Weight = 6,800.28 gm

Potassium 7.05 % K 8.50 % K₂O

Rubidium 0.18 % Rb 0.19 % Rb₂O

Barium 2.52 % Ba 2.82 % BaO

Sodium 3.48 % Na 4.69 % Na₂O

Strontium 2.32 % Sr 2.74 % SrO

Calcium 13.24 % Ca 18.52 % CaO

Zirconium 0.25 % Zr 0.34 % ZrO₂

Tantalum 0.21 % Ta 0.26 % Ta₂O₅

Titanium 3.89 % Ti 6.50 % TiO₂

Manganese 0.77 % Mn 1.10 % Mn₂O₃

Niobium 4.56 % Nb 6.53 % Nb₂O₅

Aluminum 0.16 % Al 0.31 % Al₂O₃

Iron 0.85 % Fe 0.88 % FeO / 0.23 % Fe₂O₃

Silicon 19.54 % Si 41.79 % SiO₂

Hydrogen 0.32 % H 2.84 % H₂O

Chlorine 0.42 % Cl 0.42 % Cl

- % Cl -0.09 % -O=Cl₂

Oxygen 37.53 % O

Fluorine 2.71 % F 2.71 % F

- % F -1.14 % -O=F₂

______ ______

100.00 % 100.14 % = TOTAL OXIDE

Empirical Formula:

Ca_22.46K_12.27Na_10.3Sr_1.8Ba_1.25Ti_5.53Nb_3.34Mn³⁺_0.95Fe²⁺_0.83Fe³⁺_0.2Zr_0.19Rb_0.14Ta_0.08 (OH)₁₂Si_47.3Al_0.41O_138.08(OH)_9.42Cl_0.8

Environment:

Veins cutting nephneline syenite. (close to astrophyllite)

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Mt. Eveslogchorr, Khibiny alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality

Synonym:

IMA2001-023

Eveslogite Image

Images:

Eveslogite

Comments: Yellowish brown crystal fragment of eveslogite.
Location: Yukspolark Pass, Khibiny Massif, Kola Peninsula, Russia. Scale: Specimen Size 10x7 mm.
© Sergey Vasiliev / Systematic Mineralogy

Eveslogite Crystallography

Axial Ratios:

a:b:c =0.5641:1:1.7768

Cell Dimensions:

a = 14.069, b = 24.937, c = 44.31, Z = 4; beta = 95.02° V = 15,486.03 Den(Calc)= 2.92

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/m

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

By Intensity(I/I_o): 2.853(1)(428), 3.127(0.65)(426), 2.99(0.59)(2.3.12),3.11(0.52)(364), 12.33(0.51)(020), 2.94(0.45)(24.1.2), 6.199(0.42)(040),

Physical Properties of Eveslogite

Cleavage:

{001} Perfect, {010} Perfect

Color:

Light brown, Yellow brown.

Density:

2.85

Diaphaneity:

Semitransparent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

5 - Apatite

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Eveslogite

Gladstone-Dale:

CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2191,KPDmeas= 0.2244,KC= 0.2219
Ncalc = 1.63 - 1.65

Optical Data:

Biaxial (-), a=1.631, b=1.641, g=1.647, bire=0.0160

Calculated Properties of Eveslogite

Electron Density:

Bulk Density (Electron Density)=2.79 gm/cc
note: Specific Gravity of Eveslogite =2.85 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Eveslogite= 26.49 barns/electron
U=PE_Eveslogite x r_electron= 73.90 barns/cc.

Radioactivity:

GRapi = 172.67 (Gamma Ray American Petroleum Institute Units)
Concentration of Eveslogite per GRapi unit = 0.58 (%)

Estimated Radioactivity from Eveslogite - barely detectable

Eveslogite Classification

Dana Class:

56.02.06c.07 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.02)with cations in [4] and/or >[4] coordination

(56.02.06c)Seidozerite - Lamprophyllite group (Lamprophyllite subgroup)

56.02.06c.01 Barytolamprophyllite Ba2Na3(Fe,Ti)3(Si2O7)2(O,OH,F)4 C 2/m 2/m

56.02.06c.02 Delindeite Ba2(Na,K,[])3(Ti,Fe)[Ti2(O,OH)4Si4O14](H2O,OH)2 A2/m 2/m

56.02.06c.03 Ericssonite BaMn2FeO[Si2O7](OH) C 2/m 2/m

56.02.06c.04 Lamprophyllite Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2 C 2/m 2/m

56.02.06c.05 Orthoericssonite BaMn2(FeO)Si2O7(OH) Pmmn 2/m 2/m 2/m

56.02.06c.06 Andremeyerite BaFe(Fe,Mn,Mg)Si2O7 P 2₁/c 2/m

56.02.06c.07 Eveslogite! (Ca,K,Na,Sr,Ba)48[(Ti,Nb,Fe,Mn)12(OH)12Si48O144](F,OH,Cl)14 P 2/m 2/m

56.02.06c.08 Nabalamprophyllite! Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2} P 2/m 2/m

Strunz Class:

09.DG.97 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DG -Inosilicates with 3-periodic single and multiple chains

09.DG.97 Eveslogite! (Ca,K,Na,Sr,Ba)48[(Ti,Nb,Fe,Mn)12(OH)12Si48O144](F,OH,Cl)14 P 2/m 2/m

Other Eveslogite Information

References:

NAME( AmMin, 89:249) PHYS. PROP.(AmMin, 89:249) OPTIC PROP.(AmMin, 89:249)

See Also:

Links to other databases for Eveslogite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Eveslogite

(Ca,K,Na,Sr,Ba)48[(Ti,Nb,Fe,Mn)12(OH)12Si48O144](F,OH,Cl)14
Dana No: 56.02.06c.07 Strunz No: 09.DG.97
Locality:

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