Lamprophyllite Mineral Data

Lamprophyllite Mineral Data +

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General Lamprophyllite Information

Chemical Formula:

Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2

Composition:

Molecular Weight = 891.53 gm

Barium 15.40 % Ba 17.20 % BaO

Sodium 5.16 % Na 6.95 % Na₂O

Strontium 19.66 % Sr 23.25 % SrO

Titanium 16.11 % Ti 26.88 % TiO₂

Silicon 12.60 % Si 26.96 % SiO₂

Hydrogen 0.23 % H 2.02 % H₂O

Oxygen 28.71 % O

Fluorine 2.13 % F 2.13 % F

- % F -0.90 % -O=F₂

______ ______

100.00 % 104.49 % = TOTAL OXIDE

Empirical Formula:

Na₂Sr₂BaTi₃Si₄O₁₄(OH)₂F

Environment:

In Russia, in the Lovozero and Khibiny massifs, Kola Peninsula; in the Konder, Inagli, and Yllymakh massifs, Yakutia.

IMA Status:

Valid Species (Pre-IMA) 1894

Locality:

In all rock types and most pegmatites of a differentiated alkalic massif Lovozero massif, Russia). Link to MinDat.org Location Data.

Name Origin:

From the Greek, lampros - "luster" and fyllon - "leaf" in allusion to the lusterous cleavage.

Synonym:

ICSD 39662

PDF 17-751

Lamprophyllite Image

Images:

Lamprophyllite

Comments: Deep-red, acicular spray of lamprophyllite in matrix.
Location: Kola Peninsula, Russia. Scale: Crystal size 1.5 cm.
© Tom Loomis / Dakota Matrix

Images:

Lamprophyllite Barytolamprophyllite

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

Lamprophyllite Crystallography

Axial Ratios:

a:b:c =2.7988:1:0.7648

Cell Dimensions:

a = 19.76, b = 7.06, c = 5.4, Z = 2; beta = 96.5° V = 748.49 Den(Calc)= 3.96

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): 2.773(1), 3.43(0.55), 2.13(0.45),

Physical Properties of Lamprophyllite

Cleavage:

[100] Good

Color:

Yellow, Brown.

Density:

3.44

Diaphaniety:

Translucent

Fracture:

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

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

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

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Pearly

Streak:

brownish white

Optical Properties of Lamprophyllite

Gladstone-Dale:

CI meas= 0.074 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.196 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1918,KPDmeas= 0.2208,KC= 0.2385

Optical Data:

Biaxial (+), a=1.746, b=1.754, g=1.779, bire=0.0330, 2V(Calc)=60, 2V(Meas)=21-43.

Calculated Properties of Lamprophyllite

Electron Density:

r_electron=3.20 gm/cc
note: r_{Lamprophyllite}=3.44 gm/cc.

Fermion Index

Fermion Index = 0.06806
Boson Index = 0.93194

Photoelectric:

PE_{Lamprophyllite}= 91.97 barns/electron
U=PE_{Lamprophyllite} x r_electron= 294.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lamprophyllite is Not Radioactive

Lamprophyllite Classification

Dana Class:

56.2.6c.4 (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.13-20 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 Lamprophyllite Information

References:

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

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

Lamprophyllite

Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2
Dana No: 56.2.6c.4 Strunz No: VIII/C.13-20
Locality:

Notes: