Lamprophyllite Mineral Data

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.

Name Pronunciation:

Lamprophyllite + Pronunciation

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:

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

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 - Prismatic H-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

Diaphaneity:

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
Ncalc = 1.82 - 1.94

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:

Bulk Density (Electron Density)=3.20 gm/cc
note: Specific Gravity of Lamprophyllite =3.44 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lamprophyllite is Not Radioactive

Lamprophyllite Classification

Dana Class:

56.02.06c.04 (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.BE.25 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.25 Barytolamprophyllite Ba2Na3(Fe,Ti)3(Si2O7)2(O,OH,F)4 C 2/m 2/m

09.BE.25 Ericssonite BaMn2FeO[Si2O7](OH) C 2/m 2/m

09.BE.25 Lamprophyllite Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2 C 2/m 2/m

09.BE.25 Orthoericssonite BaMn2(FeO)Si2O7(OH) Pmmn 2/m 2/m 2/m

09.BE.25 Seidozerite (Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2 P 2/c 2/m

09.BE.25 Nabalamprophyllite! Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2} P 2/m 2/m

09.BE.25 Grenmarite! (Zr,Mn)2(Zr,Ti)(Mn,Na)(Na,Ca)4(Si2O7)2(O,F)4 P 2/c 2/m

Other Lamprophyllite Information

References:

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

See Also:

Links to other databases for Lamprophyllite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Lamprophyllite

Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2
Dana No: 56.02.06c.04 Strunz No: 09.BE.25
Locality:

Notes:

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