Lamprophyllite Mineral Data

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.

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)

Search for Lamprophyllite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Lamprophyllite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Lamprophyllite Mineral Data :

Ask about Lamprophyllite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: