Barytolamprophyllite Mineral Data

Barytolamprophyllite Mineral Data +

General Barytolamprophyllite Information

Chemical Formula:

Ba2Na3(Fe+++,Ti)3(Si2O7)2(O,OH,F)4

Composition:

Molecular Weight = 905.03 gm

Barium 30.35 % Ba 33.88 % BaO

Sodium 7.62 % Na 10.27 % Na₂O

Titanium 5.29 % Ti 8.83 % TiO₂

Iron 12.34 % Fe 17.64 % Fe₂O₃

Silicon 12.41 % Si 26.56 % SiO₂

Hydrogen 0.08 % H 0.75 % H₂O

Oxygen 31.38 % O

Fluorine 0.52 % F 0.52 % F

- % F -0.22 % -O=F₂

______ ______

100.00 % 98.23 % = TOTAL OXIDE

Empirical Formula:

Ba₂Na₃Fe³⁺₂Ti(Si₂O₇)₂O₃(OH)_0.75F_0.25

Environment:

Alkalic rocks.

IMA Status:

Approved IMA 1965

Locality:

Lovozero massif, Khibiny, Kola, Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the composition and similarity to lamprophyllite.

Synonym:

ICSD 39868

PDF 34-313

Barytolamprophyllite Image

Images:

Click Here for Larger Barytolamprophyllite Image

Barytolamprophyllite Lamprophyllite

Comments: Brownish-yellow barytolamprophyllite on dark green lamprophyllite.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Barytolamprophyllite Crystallography

Axial Ratios:

a:b:c =2.7977:1:0.7607

Cell Dimensions:

a = 19.833, b = 7.089, c = 5.393, Z = 2; beta = 96.66° V = 753.12 Den(Calc)= 3.99

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): 2.85(1), 1.51(0.9), 2.19(0.9),

Physical Properties of Barytolamprophyllite

Cleavage:

[100] Perfect, [011] Good, [010] Poor

Color:

Golden brown, Dark brown.

Density:

3.62 - 3.66, Average = 3.64

Diaphaniety:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Flakes - Flat, thin crystals or aggregates.

Habit:

Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous (Glassy)

Streak:

light brown

Optical Properties of Barytolamprophyllite

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.101 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1899,KPDmeas= 0.2082,KC= 0.2112

Optical Data:

Biaxial (+), a=1.742-1.743, b=1.754, g=1.776-1.778, bire=0.0340-0.0350, 2V(Calc)=70-74, 2V(Meas)=29-30. Dispersion r > v.

Pleochroism (x):

light yellow.

Pleochroism (y):

brownish yellow.

Pleochroism (z):

brown.

Calculated Properties of Barytolamprophyllite

Electron Density:

r_electron=3.38 gm/cc
note: r_{Barytolamprophyllite}=3.64 gm/cc.

Fermion Index

Fermion Index = 0.06948
Boson Index = 0.93052

Photoelectric:

PE_{Barytolamprophyllite}= 136.48 barns/electron
U=PE_{Barytolamprophyllite} x r_electron= 461.08 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Barytolamprophyllite is Not Radioactive

Barytolamprophyllite Classification

Dana Class:

56.2.6c.1 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

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

(56.2.6c)Seidozerite - Lamprophyllite group (Lamprophyllite subgroup)

56.2.6c.1 Barytolamprophyllite Ba2Na3(Fe,Ti)3(Si2O7)2(O,OH,F)4 C 2/m 2/m

56.2.6c.2 Delindeite Ba2(Na,K,[])3(Ti,Fe)[Ti2(O,OH)4Si4O14](H2O,OH)2 A2/m 2/m

56.2.6c.3 Ericssonite BaMn2FeO[Si2O7](OH) C 2/m 2/m

56.2.6c.4 Lamprophyllite Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2 C 2/m 2/m

56.2.6c.5 Orthoericssonite BaMn2(FeO)Si2O7(OH) Pmmn 2/m 2/m 2/m

56.2.6c.6 Andremeyerite BaFe(Fe,Mn,Mg)Si2O7 P 2₁/c 2/m

56.2.6c.7 Eveslogite! (Ca,K,Na,Sr,Ba)48[(Ti,Nb,Fe,Mn)12(OH)12Si48O144](F,OH,Cl)14 P 2/m 2/m

56.2.6c.8 Nabalamprophyllite! Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2} P 2/m 2/m

Strunz Class:

VIII/C.13-30 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.13 - Rosenbuschite - Lamprophyllite - Hejtmanite series

VIII/C.13-05 Grenmarite! (Zr,Mn)2(Zr,Ti)(Mn,Na)(Na,Ca)4(Si2O7)2(O,F)4 P 2/c 2/m

VIII/C.13-10 Seidozerite (Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2 P 2/c 2/m

VIII/C.13-15 Nabalamprophyllite! Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2} P 2/m 2/m

VIII/C.13-20 Lamprophyllite Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2 C 2/m 2/m

VIII/C.13-25 Kukisvumite Na6ZnTi4Si8O28·4(H2O) Pccn 2/m 2/m 2/m

VIII/C.13-27 Shkatulkalite! Na10MnTi3Nb3(Si2O7)6(OH)2F·12(H2O) P 2,Pm,P 2/m Mono

VIII/C.13-30 Barytolamprophyllite Ba2Na3(Fe,Ti)3(Si2O7)2(O,OH,F)4 C 2/m 2/m

VIII/C.13-40 Ericssonite BaMn2FeO[Si2O7](OH) C 2/m 2/m

VIII/C.13-50 Orthoericssonite BaMn2(FeO)Si2O7(OH) Pmmn 2/m 2/m 2/m

Other Barytolamprophyllite Information

References:

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

See Also:

Links to other databases for Barytolamprophyllite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 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 - WWW-MINCRYST 15 -École des Mines de Paris

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Barytolamprophyllite

Ba2Na3(Fe+++,Ti)3(Si2O7)2(O,OH,F)4
Dana No: 56.2.6c.1 Strunz No: VIII/C.13-30
Locality:

Notes: